Die Faserglia des Selachiergehirns

Horstmann, Ernst

doi:10.1007/bf00334758

Cited by 282 publications

(80 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…So-called tanycytes and their allied cells proposed first by HORSTMANN (1954) in the brain of elasmobranchiate fish are also demonstrated in the present examination (Fig. 9).…”

Section: Discussionsupporting

confidence: 82%

Scanning Electron Microscopy of the Third Ventricular Wall in the Lamprey, <i>Lampetra japonica</i>

Shioda

Honma

Souma

et al. 1977

Arch. Histol. Jap., Arch. Histol. Jpn

View full text Add to dashboard Cite

Summary. The third ventricular wall and its adjacent region of the arctic lamprey, Lampetra japonica, were studied by scanning electron microscopy to elucidate their surface fine structures.The specimens were caught in the mouth of the river during their anadromous migration.The ventricular wall is covered entirely with the cilia of ependymal cells, with the exception of the ventral side of the lateral wall, the floor of the recessus infundibuli and a portion of the recessus posteriosus. In the ependymal layer covering the ventral side of the lateral wall, numerous protrusions of neurons are found equipped with microvilli and cilia. These neurons seem to correspond to the liquor-contacting neurons. Ependymal cells identified as tanycytes occur in the posterior portion of the floor of the recessus infundibuli.The apex of the tanycyte is provided with numerous microvilli and a bundle of cilia, while its basal projection extends towards the outer layer of neurohypophysis to make contact with the capillary wall. A small spherule considered to be a secretory substance is observed near the root of the ciliary bundle. The recessus posteriosus consists of a layer of ependymal cells and neurons with an apical projection into the ventricular cavity. Possible intraventricular macrophage (Kolmer cell) is found in the lamprey.

show abstract

“…So-called tanycytes and their allied cells proposed first by HORSTMANN (1954) in the brain of elasmobranchiate fish are also demonstrated in the present examination (Fig. 9).…”

Section: Discussionsupporting

confidence: 82%

Scanning Electron Microscopy of the Third Ventricular Wall in the Lamprey, <i>Lampetra japonica</i>

Shioda

Honma

Souma

et al. 1977

Arch. Histol. Jap., Arch. Histol. Jpn

View full text Add to dashboard Cite

show abstract

“…Even in medium-sized sharks (Ginglymostoma, Galeocerdo, Negaprion) , these studies described radial ependymoglia as the predominant element, and astrocyte-like (or at least non-ependymal) cells were scarce, most of them in perivascular position. These cells attached to the vessels by their bodies and extend their 'vasculofugal' processes into the surrounding brain substrate [Horstmann, 1954;Klatzo, 1967;Long et al, 1968;Wasowicz et al, 1999]. Round perikarya with single long processes were also found among them and similar cells have been described in quail [ Coturnix coturnix japonica ;Cameron-Curry et al, 1991] as 'unipolar astrocytes'.…”

Section: Discussionmentioning

confidence: 70%

Evolutionary Changes of Astroglia in Elasmobranchii Comparing to Amniotes: A Study Based on Three Immunohistochemical Markers (GFAP, S-100, and Glutamine Synthetase)

Ari

Kálmán

2008

Brain Behav Evol

View full text Add to dashboard Cite

This paper supplements former studies on elasmobranch species with an immunohistochemical investigation into glutamine synthetase and S-100 protein, in addition to GFAP, and extends its scope to the representatives of almost every group of Elasmobranchii: squalomorph sharks, galeomorph sharks, skates (Rajiformes) and rays (Torpediniformes and Myliobatifomes). More glial elements were labeled by S-100 protein, and even more so by using glutamine synthetase immunostaining than by GFAP: more astrocytes (mainly non-perivascular ones) were detected in the telencephalon of sharks, skates and rays. Only the markers S-100 and glutamine synthetase, but not GFAP, characterized the Bergmann-glia of skates and rays and astrocyte-like non-ependymal cells in Squalus acanthias. Another squalomorph shark species, Pristiophorus cirratus, however, had GFAP immunopositive astrocytes. Of all the species studied, the greatest number of GFAP positive astrocytes could be observed in Mobula japanica (order Myliobatiformes), in each major brain part. According to anatomical location, perivascular glia comprised varied types, including even a location in Mobula, which can also be found in mammals. Remnants of radial glia were found in confined areas of skates, less so in rays. In the rhombencephalon and in the spinal cord modified ependymoglia predominated in every group. In conclusion, there was no meaningful difference between the astroglial architectures of squalomorph and galeomorph sharks. The difference in the astroglial structure between sharks and batoids, however, was confined to the telencephalon and mesencephalon, and did not take place in the rhombencephalon, the latter structure being quite similar in all the species studied. The appearance of astrocytes in the relatively thin-walled shark telencephalon, however, indicates that the brain thickening promoted the preponderance of astrocytes rather than their appearance itself. Although the evolutionary changes of astroglia had some similarities in Elasmobranchii and Amniota, there was one meaningful difference: in Elasmobranchii astrocytes did not prevail in conservative brain regions as they did in the progressive brain regions.

show abstract

“…Both SGL astrocytes (present study) and SVZ astrocytes (Doetsch et al, 1999b) may maintain their neurogenic potential because of their derivation from radial glia. In some vertebrate species, radial glia persist in the adult brain (Horstmann, 1954;Stevenson and Yoon, 1982;Nottebohm, 1988, 1995), and, in songbirds, they divide and appear to function as the primary precursors for the continual generation of new neurons . Retroviral labeling experiments in the developing avian brain is consistent with the proposition that radial glia could function as neuronal precursors also during development (Gray and Sanes, 1992).…”

Section: Discussionmentioning

confidence: 99%

Astrocytes Give Rise to New Neurons in the Adult Mammalian Hippocampus

et al. 2001

View full text Add to dashboard Cite

Neurogenesis in the dentate gyrus of the hippocampus persists throughout life in many vertebrates, including humans. The progenitors of these new neurons reside in the subgranular layer (SGL) of the dentate gyrus. Although stem cells that can self-renew and generate new neurons and glia have been cultured from the adult mammalian hippocampus, the in vivo primary precursors for the formation of new neurons have not been identified. Here we show that SGL cells, which express glial fibrillary acidic protein and have the characteristics of astrocytes, divide and generate new neurons under normal conditions or after the chemical removal of actively dividing cells. We also describe a population of small electron-dense SGL cells, which we call type D cells and are derived from the astrocytes and probably function as a transient precursor in the formation of new neurons. These results reveal the origins of new neurons in the adult hippocampus.

show abstract

Die Faserglia des Selachiergehirns

Cited by 282 publications

References 3 publications

Scanning Electron Microscopy of the Third Ventricular Wall in the Lamprey, <i>Lampetra japonica</i>

Scanning Electron Microscopy of the Third Ventricular Wall in the Lamprey, <i>Lampetra japonica</i>

Evolutionary Changes of Astroglia in Elasmobranchii Comparing to Amniotes: A Study Based on Three Immunohistochemical Markers (GFAP, S-100, and Glutamine Synthetase)

Astrocytes Give Rise to New Neurons in the Adult Mammalian Hippocampus

Contact Info

Product

Resources

About