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  • Electronic Resource  (2)
  • 1975-1979  (2)
  • 1
    Electronic Resource
    Electronic Resource
    Ultrastructural, fluorescence microscopic and microfluorimetric study of the innervation of the axial complex in the sea urchin, Sphaerechinus granularis (Lam.) (1978)
    Springer
    Cell & tissue research 194 (1978), S. 315-326 
    Details
    ISSN: 1432-0878
    Keywords: Axial complex ; Nerve fibers ; Neuromuscular junctions ; Monoamines ; Sphaerechinus
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary In juxtaposition with the contractile epithelia of the axial complex of the sea urchin, Sphaerechinus granularis, several types of nerve fibers with different vesicle populations were determined. Nerve terminals, filled with clear vesicles and dense core vesicles, form synaptoid neuromuscular junctions. Close to the somatocoelic epithelia of the axial and terminal sinus septa, numerous axon profiles form a nerve plexus. Among the epithelial cells covering the plexus, two types of nerve cells can be distinguished which presumably produce neurosecretory and aminergic granules, respectively. Monoamine fluorescence (formaldehyde-induced fluorescence, Falck-Hillarp technique) was analyzed microspectrofluorimetrically. The emission spectrum of the fluorophores occurring in the present material shows a maximum at 475 nm and is characteristic of catecholamines; the excitation maximum at 380 nm after formaldehyde treatment is typical of catecholamines at low pH only. Since the peak ratio (370:320 nm) does not change after HCl-vapor treatment, the fluorophores are likely to be indicative of dopamine.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00220398
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Fine structure of the axial complex of Sphaerechinus granularis (Lam.) (Echinodermata: Echinoidea) (1978)
    Springer
    Cell & tissue research 193 (1978), S. 107-123 
    Details
    ISSN: 1432-0878
    Keywords: Axial complex ; Sphaerechinus ; Heamal system ; Epithelial muscle cells ; Coelomocytes ; Function
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Three regions of the axial complex in Sphaerechinus granularis can be distinguished: 1) The axial organ which protrudes from one side of the axial sinus; the sinus septum which separates the sinus from the body cavity and encloses the stone canal; the pulsating vessel which runs along the inside of the axial organ. 2) The blindly-ending terminal sinus in which the pulsating vessel broadens out to the contractile terminal process. 3) The ampulla of the stone canal which connects the axocoel and water vascular system and which opens out through the madreporite. A single-layered, monociliated coelomic epithelium surrounds all regions of the axial complex. This epithelium contains smooth muscle cells at the contractile areas. Canaliculi, surrounded by basal lamina, are formed through infolding of epithelia; they end blindly in the fluid and connective tissue -matrix of the inner structures. The lacunae of the dorso-ventral mesentery connect the periesophageal and the perianal haemal ring with the axial organ. The axial organ contains many coelomocytes rich in pigment and granules. These coelomocytes are separated into compartments by elastic fibres. Phagocytosis of whole cells and transformational stages of coelomocytes suggest storage and degradation functions. An excretory function via the water vascular system is also suggested.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00221605
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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