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  • 1
    Electronic Resource
    Electronic Resource
    The fine structure of prostomial photoreceptors in Eulalia viridis (Polychaeta; Annelida) (1974)
    Springer
    Cell & tissue research 154 (1974), S. 379-398 
    Details
    ISSN: 1432-0878
    Keywords: Photoreceptors ; Polychaete ; Submicrovillar cisternae ; Fine structure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The prostomium of Eulalia viridis has both microvillar and ciliary photoreceptors. The compound eyes each consist of a central lens surrounded by a layer of sensory and pigment cells. They resemble those of nereids, except that the lens is composed of vesiculated droplets produced by a specialized lenticular cell located in the cell layer surrounding the lens. Photoreceptoral microvilli of the sensory cell outer segments are underlain by “submicrovillar cisternae” (or SMC). The axial filament is ensheathed by part of the SMC complex. The sensory cells of the posterior photoreceptors are similar in cytology to those of the compound eyes but are not organized into “eyes”. Each ciliary photoreceptor unit consists of an extracellular vacuole bounded by a supporting cell and the ciliated terminal of a sensory cell dendrite which projects into the vacuole. They are similar to the ciliary photoreceptors of nereids. The discussion seeks to establish SMC as an important component of microvillar photoreceptors in polychaetes. SMC resemble subrhabdomeric cisternae of arthropod eyes and also lamellate structures found in photoreceptors of other animals. SMC are probably involved with the metabolism of photopigment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00223733
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  • 2
    Electronic Resource
    Electronic Resource
    Fine structure of nuchal organs in some errant polychaetous annelids (1974)
    New York, NY : Wiley-Blackwell
    Journal of Morphology 144 (1974), S. 167-183 
    Details
    ISSN: 0362-2525
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: The nuchal organs of polychaetes from four different families (Nereidae, Nephtyidae, Phyllodocidae and Glyceridae) were examined with the light and electron microscopes. In each case, the organ consists of ciliated cells and primary sensory elements. The ciliated cells are similar to the cells of the adjacent epidermis but bear motile cilia. Primary sensory neurons are situated within the organs in Nephtyidae and Phyllodocidae, but are located within the brain in Nereidae and Glyceridae. Each sensory cell gives rise to a distal process which penetrates between the ciliated cells to form an apical sensory bulb bearing modified cilia. Apically these processes are lined with juxtamembranous plaques. The ciliated cells are innervated by efferent axons from the brain, and in Nereis the axons appear to be peptidergic. The elements comprising the nuchal organs closely resemble those of the vertebrate olfactory mucosa.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jmor.1051440204
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  • 3
    Electronic Resource
    Electronic Resource
    Further observations on the fine structure of the infracerebral gland in Nereis (Annelida; Polychaeta)  -  C2 and C3 cells; centripetal and centrifugal fibersSupported by Research Grant B/SR 9636, from the Science Research Council, U.K. (1976)
    New York, NY : Wiley-Blackwell
    Journal of Morphology 150 (1976), S. 1-17 
    Details
    ISSN: 0362-2525
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: The infracerebral gland of Nereis is made up of three types of cells. C1 cells are hypertrophied pericapsular elements, whereas C2 and C3 cells have the morphological and cytological features of neurosecretory neurons. C2 and C3 cells give rise to centripetal “proximal processes” which extend into the brain through the midventral pocket formed by delamination of the brain capsule. Their “distal processes” terminate within the gland or its immediate vicinity. “Centrifugal fibers” arise from nerve cells located within the brain and appear to synapse upon the proximal processes of C2 cells in the region of the midventral pocket and in the ventral region of the brain. The cytology of C2 and C3 cells suggests that they are the source of distinct peptide hormones.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jmor.1051500102
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