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  • 1
    Electronic Resource
    Electronic Resource
    Comparative ultrastructure of cerebrospinal fluid-contacting neurons and pinealocytes (1975)
    Springer
    Cell & tissue research 158 (1975), S. 409-424 
    Details
    ISSN: 1432-0878
    Keywords: Cerebrospinal fluid-contacting neurons ; Pinealocytes ; Synapses ; Comparative ultrastructure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The pinealocytes of fishes, amphibians, reptiles, birds and mammals have been compared with cerebrospinal fluid (CSF) contacting neurons. We found that the intraventricular dendrite terminal of the latter resembles the pinealocytic inner segment and that the atypical cilium (9x2+0 tubules) of the CSF contacting neurons is analogous with the outer segment of the pinealocytes, even though the outer segment bears photoreceptor lamellae in lower vertebrates. Regular, but small-sized photoreceptor outer segments were also found on pinealocytes of the chicken. In mammals, too, primitive outer segments are present in the form of 9x2+0 cilia similar to those of CSF contacting dendritic terminals. In the Golgi areas of the perikarya of both cell types there are granulated vesicles which may contain transmitter substances and/or neurohormones. The synaptic junctions of the pinealocytes differ from those of the CSF contacting neurons. Many synapses occur on the latter, but they appear only rarely on pinealocytes. The axons of the CSF contacting neurons form synaptic connections with other cells, or terminate as neurohormonal synaptic hemidesmosomes on the basal lamina of the brain surface. The pinealocyte axons give rise to terminals containing synaptic ribbons. Such ribbons do not occur in CSF contacting neurons. In Lacertilians, we found pinealocytic terminals without ribbons on dendrite-like profiles. On the basis of the ultrastructural comparisons, we consider the CSF contacting neurons and pinealocytes to be very similar, but not to represent precisely the same cell type.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00223836
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Cerebrospinal fluid-contacting neurons, sensory pinealocytes and Landolt's clubs of the retina as revealed by means of an electron-microscopic immunoreaction against opsin (1983)
    Springer
    Cell & tissue research 233 (1983), S. 539-548 
    Details
    ISSN: 1432-0878
    Keywords: CSF-contacting neurons ; Pinealocytes ; Retinal photoreceptors ; Landolt's clubs ; Opsin immuno-electron microscopy ; Teleostei, Amphibia
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Opsin-immunoreactive sites of hypothalamic cerebrospinal fluid (CSF)-contacting neurons, pinealocytes and retinal cells were studied in various vertebrates (Carassius auratus, Phoxinus phoxinus, Triturus cristatus, Bombina bombina, Rana esculenta) by means of postembedding immuno-electron microscopy with the use of the protein A-gold labeling method. The retina of the rat served as a general reference tissue for the quality of the immunocytochemical reaction. A strong opsin immunoreaction (rat-antibovine opsin serum) was obtained in the rod-type outer segments of photoreceptors in the retina of all species studied. Cone-type outer segments exhibited only very few antigenic binding sites. In the pineal organ of the goldfish and the frog, outer segments of the photoreceptor cells displayed strong immuno reactivity. No immunoreaction was found in hypothalamic CSF-contacting neurons and Landolt's clubs of nerve cells of the bipolar layer of the retina. The morphological similarity between the ciliated dendritic terminal of the Landolt's club and the intraventricular dendritic ending of the CSF contacting neurons is emphasized.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00212223
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Light- and electron-microscopic demonstration of immunoreactive opsin in the pinealocytes of various vertebrates (1981)
    Springer
    Cell & tissue research 221 (1981), S. 451-463 
    Details
    ISSN: 1432-0878
    Keywords: Pineal photoreceptors ; Pinealocytes ; Opsin immunoreactivity ; Rhodopsin-like photopigments ; Comparative aspects (vertebrates)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary An antibody to opsin isolated from rod outer segments of the frog retina was applied in light- and electron-microscopic immunocytochemical studies to the pineal organ of various vertebrates (Cyprinus carpio, Carassius auratus, Rana esculenta, Emys orbicularis, Pseudemys scripta elegans, Lacerta agilis and viridis, Gallus domesticus, Columba livia, Melopsittacus undulatus, Serinus canaria, Taeniopyga punctata, Didelphis virginiana, Erinaceus roumanicus, Myotis myotis, rabbit, rat, cat). A strong immunoreaction was visible in the outer segments of the pinealocytes of one anuran and several teleost species. The outer segments of pinealocytes in the chelonian reptiles and birds also contained immunoreactive opsin. Ultrastructurally, PAP complexes were localized to the photoreceptor membranes of the outer segments. Immunoreactivity for opsin could not be demonstrated in the lacertilian parietal eye and pineal organ. In the opossum (Marsupialia), pinealocytes remain in contact with the intrapineal invaginations of the pineal recess. In insectivores, the cilia of the pinealocytes exhibit a relation to glial cells similar to that between the outer segments of retinal photoreceptors and the pigment cells. The cilia of mammalian pinealocytes did not show a clear-cut immunoreactivity to opsin with the electron-microscopic technique employed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00216748
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    Paper (German National Licenses)
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