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Echinobase
ECB-ART-35290
Cell Tissue Res 1982 Jan 01;2263:675-87. doi: 10.1007/bf00214794.
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The giant neurone system in ophiuroids. III. The detailed connections of the circumoral nerve ring.

Cobb JL , Stubbs TR .


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The morphology of the circumoral nerve ring of an ophiuroid, Ophiura texturata, is described. Particular attention is given to a system of fibres which are giant by echinoderm standards, and which occur both in the ectoneural and hyponeural parts of the nerve ring. The giant fibres in the ectoneurla tissue do not show the complicated pattern of distribution present in the segmental ganglia of the radial nerves. The main areas of neuropil in the ectoneural tissue are associated with small axon bundles which leave the nerve ring to innervate the gut and disc. The hyponeural tissue is exclusively motor and is involved in the innervation of the main radial and inter-radial muscles of the disc. Branches of the motor nerves are also associated with juxtaligamental tissue, the secretory products from which are thought to influence the plasticity of collagenous connective tissue. The structure of the circumoral nerve ring suggests that it serves as a functional connection between the nerve cords in adjacent radii. The ultrastructural evidence does not support the view that the circumoral nerve ring represents a central nervous system.

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Genes referenced: tefl

References [+] :
Bachmann, Phagocytes in the axial complex of the sea urchin, Sphaerechinus granularis (Lam.). Fine structure and x-ray microanalysis. 1980, Pubmed, Echinobase