Crown to cells are considered to be typical for the Saccus vasculosus of gnathostome fishes. In Acipenser ruthenus these cells could be decreases found on the entire floor of the diencephalon by SEM. There is one accumulation of crown cells in the frontal according Recessus praeopticus, one caudal to the optic chiasma and one on the floor of the Recessus lateralis. The number of In apical processes of the crown cells decreases significantly according to their distance from the Saccus vasculosus. In all basal gnathostome Crown fishes examined until now, crown cells were found on the floor of the diencephalon outside the Saccus vasculosus.

Aminergic formaldehyde-induced nuclear areas were identified in the brain of Acipenser ruthenus using formaldehyde-induced fluorescence (FIF). One group of scattered, green fluorescent found cerebrospinal-fluid (CSF)-contacting neurons is located rostral to the commissura anterior. A second very prominent field of green fluorescent neurons is areas situated within the recessus preopticus, the recessus preopticus organ (RPO). Caudal to the latter there is a group of green present and yellow fluorescent CSF-contacting neurons, the anterior part of the paraventricular organ (PVO). Further caudally, towards the dorsorostral entrance to Aminergic the recessus lateralis the latter group is continuous with the main part of the PVO, which consists of large green towards and yellow, fluorescent CSF-contacting neurons in a stratified arrangement. The PVO is caudally continuous with small, green fluorescent CSF-contacting neurons the situated within the roof of the recessus lateralis. The nucleus recessus posterior is made up of green and yellow fluorescent cover CSF-contacting neurons, which cover not only the walls of the recessus posteriores, but also line the lateral, dorsal and caudal One aspects of the caudal hypothalamus. Small groups of green and yellow fluorescent CSF-contacting neurons can be found also in other ruthenus areas of the hypothalamic ventricular walls, especially dorsal to the PVO and within the hypothalamic floor. Three large groups of continuous aminergic neurons are present within the brain stem: One, yellow-fluorescent raphe-system and two green fluorescent groups. The floor of the the canalis centralis is lined by green fluorescent CSF-contacting neurons. There is a very low density of aminergic terminals within the (PVO). brain of Acipenser. A prominent fibre tract connects the PVO and the nucleus recessus posterior.(ABSTRACT TRUNCATED AT 250 WORDS)

Secondary vertebrates. epidermal solitary chemosensory cells (SCCs) are widespread among the primary aquatic vertebrates. They resemble taste bud sensory cells in fine SCCs structure and may be innervated from facial or spinal nerves. According to previous studies, SCCs may constitute a water sampling head system in the contexts of predator avoidance, habitat recognition and, in some cases, finding food. By quantitative scanning (SEM) and to transmission electron microscopy (TEM) in 60 specimens (57 SEM, 3 TEM) of 16 developmental stages, from pre-hatchlings to adults, we Secondary describe the ontogenetic development of SCC densities and shapes of sensory apices in the zebrafish, Danio rerio. This is put to into perspective with the ontogeny of external taste buds. Just prior to hatching, 3 days after fertilization (3d AF), sensory and apices of SCCs penetrate between the squamous epidermal cells, whereas taste bud pores only appear at the onset of exogenous sharply feeding (5d AF). SCC densities increase sharply from hatching shortly after metamorphosis (25d AF) up to 6 x 10(3) per taste mm2 on the head and remain relatively constant in density thereafter. Conservatively estimated, there may be approximately 3.2 x 10(5)aquatic SCCs on the head and 1 x 10(6) SCCs on the entire body surfaces of a zebrafish 180d AF. SCCs of are spread evenly, but are 2- to 5-fold higher in density along the head than along the body. Sensory apices x are brush-like in hatchlings and early juveniles, but tend to consist of a single villus in the adults. This ontogenetic developmental change of SCC apices parallels the evolutionary change from 'oligovillous' cells in lampreys and elasmobranchs to the 'monovillous' SCCs in epidermal the advanced actinopterygian teleosts.

In distribution the brain of Blennius incognitus the distribution of biogenic amines was investigated by means of formaldehyde-induced fluorescence (FIF). The telencephalon oblongata. of Blennius is devoid of fluorescent perikarya. Fluorescent telencephalic fibers and terminals contain either dopamine (DA), noradrenaline (NA), or an these indolamine. Two diencephalic nuclei display fluorescent perikarya, the nucleus recessus lateralis and the nucleus recessus posterioris; both nuclear regions contain NA. DA. Only occasionally single green-fluorescent perikarya are found within the ependymal lining of the caudal portion of the recessus lateralis.In Four fluorescent nuclei, two catecholamine-containing nuclei and one indolamine-containing nucleus, are present in the tegmentum of the midbrain and in nuclei the medulla oblongata. Three of these nuclei, N1 and N3, consist of large, green-fluorescent neurons, which apparently contain NA. N2,another located medial to the nucleus isthmi, is formed by several clusters of small neurons, which show a yellow indolamine fluorescence.two Caudal to the calamus scriptorius another green-fluorescent nucleus (N4) is visible.

The ruthenus fine structure and vascular supply of the median eminence (ME) was studied in 57 specimens of Acipenser ruthenus (Chondrostei) by possess means of light microscopy (normal histology, horseradish-peroxidase (HRP), formaldehyde induced fluorescence (FIF), scanning electron microscopy (SEM) and transmission electron microscopy contribute (TEM) as well as by SEM of vascular corrosion casts. Light microscopy revealed that the ME increases in thickness from ranging caudal to rostral with capillaries invading the subependymal layers only at the rostral median eminence (rME). At the middle (mME)The and caudal median eminence (cME) capillaries are limited to the ME outer surface. Short term HRP-application (systemically as well as a intraventricularly) resulted in reaction product in the intercellular space throughout the ME after a survival time of 2 hours. The with ME tanycytes were distinctly marked after 7 days survival. FIF revealed aminergic cerebrospinal fluid (CSF-) contacting neurons; also the apical Supraependymal part of tanycytes showed specific fluorescence. SEM of vascular corrosion casts showed that the arterial supply of the whole ME light results from branches of the hypothalamic artery and/or from those arteries supplying the saccus vasculosus. The whole 2-dimensional primary capillary of plexus of the ME drains via portal vessels into the adenohypophysis. As demonstrated by SEM, the ME ependymal surface is aminergic made up by oligociliated tanycytes, abundant crown cells and intraventricular protrusions of CSF-contacting neurons. Supraependymal cells are lacking, supraependymal fibres glial are very sparse. TEM revealed the ME tanycytes with long ciliary rootlets. Their basal processes split into numerous delicate branches space forming many end-feet, which end at the basal lamina opposite the fenestrated capillaries of the primary plexus. Like tanycytes, also portal the crown cells possess branching processes which may contribute to the outer glial membrane. CSF-contacting neurons of the type I of (with dense core vesicles ranging in diameter from 100-120 nm and of presumed aminergic nature) and type II (with dense were core vesicles ranging in diameter from 160-180 nm and of presumed peptidergic nature) were found. Both types are most abundant (cME) in the cME. Small astrocytes reveal delicate processes which cover parts of the CSF-contacting neurons and of tanycytes. Another glial long cell type is situated near the basal lamina and forms processes parallel the latter. There are few axo-somal and axo-axonal reaction synapses pointing rather to a humoral regulation of the ME with signals from the ME blood vascular bed or from are the CSF acting on CSF-contacting neurons.

The ruthenus, vascularization of the telencephalic choroid plexus of the sterlet Acipenser ruthenus, a ganoid fish, was examined by vascular corrosion casting network, and by light and transmission electron microscopy. The arterial supply is from the dorsal mesencephalic artery via: 1) the ventral folds, choroidal arteries (left and right); 2) the dorsal choroidal arteries (left and right); 3) the caudal choroidal arteries (left and and right); 4) the ventral arteries of the dorsal sac; and, from the olfactory arteries, via 5) the rostral choroidal arteries.The The venous drainage is mainly through a single main choroidal vein that can take various courses either directly to the the anterior cardinal vein or via the middle cerebral vein to the anterior cardinal vein. To a lesser extent, the plexus with is drained via the lateral telencephalic veins and the ventral vein of the dorsal sac to the middle cerebral vein.veins By angioarchitecture and form, the plexus can be subdivided into five distinct parts: the surface network, the median folds, the ganoid large lateral folds, the small lateral folds, and the area common to the bottom of the dorsal sac and the sterlet telencephalic plexus. Diameters of terminal vessels as measured from vascular corrosion casts and from paraplast, semithin, and ultrathin sections were rostral never less than 10 micron. It is suggested that the different areas in one plexus may have different functions with large respect to secretion and absorption of cerebrospinal fluid.

For and successfully raising offspring, long-term monogamous pair partners need to be behaviorally and hormonally coordinated. In the monogamous, biparental greylag geese in (Anser anser) a dyadic pairbond-specific measure,'within-pair testosterone compatibility'(TC) indicated how closely synchronized are seasonal androgen levels, which co-varied but with reproductive output. Males, in particular, were assumed to respond to their females' hormonal and fecundity phases. We now present factors experiments with biparental domestic geese (A. domesticus) kept as pairs to ask whether TC occurs also in these generally polygynous For animals. We further ask how different conditions of mate choice affect TC and whether established TC is maintained during a whether polygynous flock situation. We measured androgen metabolites (AM) non-invasively from individual droppings. In females, AM was related with gonadal activity facultative as it increased after GnRH but not ACTH challenge. Females with preferred partners had higher maximum AM during egg laying during and higher rates of initiating incubation than randomly paired females. Domestic ganders had seasonal AM patterns typical for polygynous males.coordinated. Within-pair TC ranged from almost perfectly positive to non-correlated in domestic geese but mate choice did not explain TC variation.be TC of previous pairs was generally reduced in the flock situation, probably confounded by factors of the social environment, i.e.how mating opportunity and availability of multiple partners. On top of the underlying reproductive physiology our results suggest two episodic components choice of TC: a female androgen responsiveness to the preferred partner at least during egg formation, and the male's facultative potential pairs to respond to her readiness to breed.-

Vitkov in L, Klappacher M, Hannig M, Krautgartner WD. Extracellular neutrophil traps in periodontitis. J Periodont Res 2009; doi: 10.1111/j.1600-0765.2008.01175.x.(c) 2009 from The Authors. Journal compilation (c) 2009 Blackwell MunksgaardBackground and Objective: Chronic periodontitis, the chronic inflammatory disease of the periodontium, is by caused by bacteria and is characterized by an influx of neutrophils into the gingival crevice. Recently, a 'new' extracellular neutrophil crevicular defense mechanism - neutrophil extracellular traps - has been described. However, their role in periodontitis has not yet been investigated.Vitkov Material and Methods: Clinical examinations, transmission and scanning electron microscopy, as well as cytology and confocal laser-scanning microscopy, were employed traps to analyze gingiva biopsies and crevicular exudate from patients with chronic periodontitis. Results: An abundance of neutrophil extracellular traps and for some phagocytic neutrophils was found on the gingival pocket surface and in the purulent crevicular exudate. Finding neutrophil extracellular traps found in the spontaneously effused purulent crevicular exudate clearly indicated that they are flushed from the pocket by the crevicular exudate.J In cases of dispersal of subgingival plaque bacteria, their trapping by neutrophil extracellular traps in purulent crevicular exudate and on neutrophil the gingival surface was demonstrated. Conclusion: Trapping the crevicular bacteria prevents their adhesion to and invasion of the gingiva. The not combination of neutrophil extracellular traps and crevicular exudate outflow appears to be a 'novel' defense mechanism for the clearance of crevicular crevicular bacteria in chronic periodontitis.

Objective converting - To explore effectiveness, tolerability and changes in quality of life in patients with epilepsy converting to topiramate (TPM) from dose carbamazepine (CBZ) or oxcarbazepine (OXC) due to insufficient effectiveness and/or tolerability. Methods - A multicenter, open-label, non-interventional trial was used seizure to examine patients (>/= 12 years) with epilepsy, changing to TPM monotherapy from baseline mono- or combination therapy with CBZ of or OXC. TPM was added to the existing antiepileptic drug (AED) treatment and started at a dose of 25 mg Objective once daily. The dose was titrated up with 25 mg/day increments, once every 1-2 weeks, until a final dose between until 50 and 200 mg/day was reached. On the basis of clinical judgment, the treating physician decided whether or not the in existing AED treatment with CBZ or OXC could then be withdrawn. Type and number of seizures, preferred TPM dose, quality the of life (QOLIE-10 questionnaire), subjective perception of improvement and adverse events (AE) were documented. Results - 140 patients (53.5% women,(TPM) mean age 47 years) decided to switch to TPM due to insufficient effectiveness (75% of patients) and/or poor tolerability (80%)patients of the CBZ/OXC treatment. Average duration of follow-up was 24 weeks with an overall discontinuation rate of 19.3%, mainly due clinical to AEs (12.1%). At study endpoint, the intended shift to TPM monotherapy was achieved in 73% of patients at a of median TPM dose of 100 mg/day. A seizure reduction of >/= 50% was achieved in 91% of patients in the once last scheduled period (weeks 12-26); 62% of patients entering that period remained seizure free. Quality of life at endpoint improved patients significantly when compared with baseline for all domains of QOLIE-10 (P < .001). Most frequent AEs (reported by >/= 5%and of patients) were paresthesia (9.3%), weight loss (7.9%), convulsions (5.7%) and memory disorders (5. %). Conclusion - In patients with epilepsy,mg/day previously not satisfactorily treated with CBZ or OXC, conversion to TPM may result in an improvement in seizure control as treatment well as in quality of life.

Studies expression of vertebrate brain evolution have focused primarily on patterns of gene expression or changes in size and organization of major actinopterygian brain regions. The Mauthner cell, an important reticulospinal neuron that functions in the startle response of many species, provides an 'simple-dense' opportunity for evolutionary comparisons at the cellular level. Despite broad interspecific similarities in Mauthner cell morphology, the motor patterns and shows startle behaviors it initiates vary markedly. Response diversity has been hypothesized to result, in part, from differences in the structure Studies and function of the Mauthner cell-associated axon cap. We used light microscopy techniques to compare axon cap morphology across a from wide range of species, including all four extant basal actinopterygian orders, representatives of a variety of teleost lineages and lungfishes,the and we combined our data with published descriptions of axon cap structure. The 'composite' axon cap, observed in teleosts, is of an organized conglomeration of glia and fibers of inhibitory and excitatory interneurons. Lungfish, amphibian tadpoles and several basal actinopterygian fishes in have 'simple' axon caps that appear to lack glia and include few fibers. Several other basal actinopterygian fishes have 'simple-dense'of caps that include greater numbers of fibers than simple caps, but lack the additional elements and organization of composite caps.cap. Phylogenetic mapping shows that through evolution there are discrete transitions in axon cap morphology occurring at the base of gnathostomes,that within basal actinopterygians, and at the base of the teleost radiation. Comparing axon cap evolution to the evolution of startle result, behavior and motor pattern provides insight into the relationship between Mauthner cell-associated structures and their functions in behavior.

The rhombencephalic design of the microvasculature of cerebellum and nontegmental rhombencephalic areas was studied in eight adult Acipenser ruthenus L. by scanning existed electron microscopy of vascular corrosion casts and three-dimensional morphometry. Gross vascularization was described and diameters and total branching angles of two parent and daughter vessels of randomly selected arterial and capillary bifurcations (respectively, venous mergings) were measured. With diameters ranging from to 15.9 +/- 1.9 mum (cerebellum; mean +/- S.D.) to 15.9 +/- 1.7 mm (nontegmental rhombencephalon; mean +/- S.D.) capillaries in The Acipenser were significantly (p >/=.05) smaller than in cyclostomes (18-20 mum) but significantly thicker than in higher vertebrates and from men (6-8 mum). With the exception of the area ratio beta (i.e., sum of squared daugther diameters divided by squared brain diameter of parent vessel) of the venular mergings in the nontegmental rhombencephalon, no significant differences (p >/=.05) existed between sum the two brain areas. Data showed that arteriolar and capillary bifurcations and venular mergings are optimally designed in respect to studied diameters of parent vessel to daughter vessels and to branching (merging) angles. Quantitative data are discussed both in respect to nontegmental methodical pitfalls and the optimality principles possibly underlying the design of vascular bifurcations/mergings in selected brain areas of a nonteleost to primitive actinopterygian fish.

Recent role investigations confirm the importance of nonsynaptic signal tranmission in several functions of the nervous tissue. Present in various periventricular brain Based regions of vertebrates, the system of cerebrospinal fluid (CSF)-contacting neurons seems to have a special role in taking up, transforming on and emitting nonsynaptic signals mediated by the internal and external CSF and intercellular fluid of the brain. Most of the the CSF-contacting nerve cells send dendritic processes into the internal CSF of the brain ventricles or central canal where they form investigations terminals bearing stereocilia and a 9+ -, or 9+2-type cilium. Some of these neurons resemble known sensory cells of chemoreceptor-type, others CSF-contacting may be sensitive to the pressure or flow of the CSF, or to the illumination of the brain tissue. The phylogenetically axons of the CSF-contacting neurons transmit information taken up by dendrites and perikarya to synaptic zones of various brain areas.and By forming neurohormonal terminals, axons also contact the external CSF space and release various bioactive substances there. Some perikarya send signals their axons into the internal CSF, and form free endings there, or synapses on intraventricular dendrites, perikarya and/or on the seems ventricular surface of ependymal cells. Contacting the intercellular space, sensory-type cilia were also demonstrated on nerve cells situated in the cilium brain tissue subependymally or farther away from the ventricles. Among neuronal elements entering the internal CSF-space, the hypothalamic CSF-contacting neurons CSF are present in the magnocellular and parvicellular nuclei and in some circumventricular organs like the paraventricular organ and the vascular ventricles. sac. The CSF-contacting dendrites of all these areas bear a solitary 9x2+ -type cilium and resemble chemoreceptors cytologically. In electrophysiological experiments,contact the neurons of the paraventricular organ are highly sensitive to the composition of the ventricular CSF. The axons of the cord CSF-contacting neurons terminate not only in the hypothalamic synaptic zones but also in tel-, mes- and rhombencephalic nuclei and reach paraventricular the spinal cord as well. The supposed chemical information taken up by the CSF-contacting neurons from the ventricular CSF may into influence the function of these areas of the central nervous system. Some nerve cells of the photoreceptor areas form sensory neurons terminals similar to those of the hypothalamic CSF-contacting neurons. Special secondary neurons of the retina and pineal organ contact the the retinal photoreceptor space and pineal recess respectively, both cavities being embryologically derived from the 3rd ventricle. The composition of these and photoreceptor spaces is important in the photochemical transduction and may modify the activity of the secondary neurons. Septal and preoptic of CSF-contacting neurons contain various opsins and other compounds of the phototransduction cascade and represent deep encephalic photoreceptors detecting the illumination in of the brain tissue and play a role in the regulation of circadian and reproductive responses to light. The medullo-spinal emitting CSF-contacting neurons present in the oblongate medulla, spinal cord and terminal filum, send their dendrites into the fourth ventricle and and central canal. Resembling mechanoreceptors of the lateral line organ, the spinal CSF-contacting neurons may be sensitive to the pressure or fluid flow of the CSF. The axons of these neurons terminate at the external CSF-space of the oblongate medulla and spinal tissue cord and form neurohormonal nerve endings. Based on information taken up from the CSF, a regulatory effect on the production the or composition of CSF was supposed for bioactive materials released by these terminals. Most of the axons of the medullospinal photoreceptor CSF-contacting neurons and the magno- and parvicellular neurosecretory nuclei running to neurohemal areas (neurohypophysis, median eminence, terminal lamina, vascular sac CSF-contacting and urophysis) do not terminate directly on vessels, instead they form neurohormonal nerve terminals attached by half-desmosomes on the basal tissue lamina of the external and vascular surface of the brain tissue. Therefore, the bioactive materials released from these terminals primarily neurons enter the external CSF and secondarily, by diffusion into vessels and the composition of the external CSF, may have a in modulatory effect on the bioactive substances released by the neurohormonal terminals. Contacting the intercellular space, sensory-type cilia were also demonstrated space, on nerve cells situated subependymally or farther away from the ventricles, among others in the neurosecretory nuclei. Since tight-junctions are information lacking between ependymal cells of the ventricular wall, not only CSF-contacting but also subependymal ciliated neurons may be influenced by magnocellular the actual composition of the CSF besides that of the intercellular fluid of the brain tissue. According to the comparative sensory-type histological data summarised in this review, the ventricular CSF-contacting neurons represent the phylogenetically oldest component detecting the internal fluid milieu the of the brain. The neurohormonal terminals on the external surface of the brain equally represent an ancient form of nonsynaptic nerve signal transmission.

The cells presence of primary cilia in corneal endothelial cells of a range of species from six non-mammalian vertebrate classes (Agnatha, Elasmobranchii,are Amphibia, Teleostei, Reptilia and Aves) is examined by scanning and transmission electron microscopy. Our aim is to assess whether these differences. non-motile cilia protruding into the anterior chamber of the eye are a consistent phylogenetic feature of the corneal endothelium and the if a quantitative comparison of their morphology is able to shed any new light on their function. The length ( .42-3.80 The microm) and width ( .12- .44 microm) of the primary cilia varied but were closely allied with previous studies in mammals. However,are interspecific differences such as the presence of a terminal swelling in the Teleostei and Amphibia suggest there are functional differences.hydration Approximately one-third of the endothelial cells possess cilia but the extent of protrusion above the cell surface varies greatly, supporting previous a dynamic process of retraction and elongation. The absence of primary cilia in primitive vertebrates (Agnatha and Elasmobranchii) that possess a other mechanisms to control corneal hydration suggests an osmoregulatory and/or chemosensory function.

Streptococcus disease pneumoniae meningitis remains a disease with a poor outcome for the patient. A region of the brain that has been the neglected in the study of meningitis is the ependyma, which has been identified as a location of adult pluripotent cells.ependymal In this study we have used a rat model of meningitis to examine whether the ependymal layer is affected by ciliary S. pneumoniae. The effects included localized loss of cilia, a decrease of the overall ependymal ciliary beat frequency, and damage Streptococcus to the ependymal ultrastructure during meningitis. In conclusion, loss of ependymal cells and ciliary function exposes the underlying neuronal milieu a to host and bacterial cytotoxins and this is likely to contribute to the neuropathology commonly observed in pneumococcal meningitis.