Summary
The ultrastructure of the gills of Echinus esculentus is described using transmission electron microscopy. The gills are covered by typical epithelial cells overlying a collagenous basement membrane. The coelomic lumen of the gills is thrown into a series of irregular grooves and ridges which are formed by long narrow cells from each of which projects a single cilium. There is a layer of muscle cells lying underneath these cells adjacent to the basement membrane. They are innervated by axons containing large granular vesicles and the significance of this innervation is discussed in terms of neuromuscular junctions in general within the echinoderms. This study shows that the main function of the gills is excretory and describes three apparent systems whereby excretory products and necrotic coelomocytes are removed.
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References
Bargmann, W., Hehn, G. von: Über das Axialorgan (“Mysterious gland”) von Asterias rubens (L). Z. Zellforsch. 88, 262–277 (1968)
Binyon, J.: Physiology of echinoderms. London: Pergamon Press 1972
Cobb, J.L.S.: The innervation of the ampulla of the tubefoot in the starfish (Astropecten irregularis). Proc. roy. Soc. B 168, 91–99 (1967)
Cobb, J.L.S.: The fine structure of the pedicellariae of Echinus esculentus (L.). I. The innervation of the muscles. J. roy. micr. Soc. 88, 211–221 (1967)
Cobb, J.L.S.: The innervation of the oesophagus of the sea urchin Heliocidaris erythrogramma. Z. Zellforsch. 98, 323–332 (1969)
Cobb, J.L.S.: The significance of the radial nerve cords in asteroids and echinoids. Z. Zellforsch. 108, 457–474 (1970)
Cobb, J.L.S., Pentreath, V.W.: The identification of chemical synapses in echinoderm nervous systems. Thalassia jugosl. (in press)
Cobb, J.L.S., Pentreath, V.W.: Anatomical studies of simple invertebrate synapses utilizing stage rotation electron microscopy and densitometry. Tiss. Cell 9, 125–135 (1977)
Doyle, W.L.: Vesiculated axons in haemal vessels of a Holothurian, Cucumaria frondosa. Biol. Bull. Mar. biol. Lab. Woods Hole 32, 329–336
Durham, H.E.: On wandering cells in echinoderms etc., more especially with regard to excretory function. Quart. J. micr. Sci. 33, 81–121
Florey, E., Cahill, M.: Ultrastructure of sea urchin tubefeet. Cell Tiss. Res. 177, 195–214 (1977)
Hehn, G. von: Über den Feinbau des hyponeuralen Nervensystems des Seesternes (Asterias rubens L.). Z. Zellforsch. 105, 137–154 (1970)
Kawaguti, S.: Electron microscopy of the radial nerve of a starfish. Biol. J. Okayama Univ. 11, 41–52 (1965)
Millott, N.: The axial organ of echinoids, re-interpretation of its structure and function. Symp. Zool. Soc. Lond. 20, 53–63 (1967)
Pentreath, V.W., Cobb, J.L.S.: Neurobiology of echinodermata. Biol. Rev. 47, 363–392 (1972)
Vevers, H.G.: The histochemistry of the echinoid axial organ. Symp. Zool. Soc. Lond. 20, 65–74 (1967)
Welsh, J.H.: Neurohumours and neurosecretion in physiology of echinodermata (R.A. Boolootian, ed.), pp. 545–560. New York: Interscience
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Cobb, J.L.S., Sneddon, E. An ultra-structural study of the gills of Echinus esculentus . Cell Tissue Res. 182, 265–274 (1977). https://doi.org/10.1007/BF00220595
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DOI: https://doi.org/10.1007/BF00220595