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- Title
La structure et I'innervation du diaphragme de la gaine tentaculaire chez deux Bryozoaires Malacostéges.
- Authors
LUTAUD, GENEVIEVE
- Abstract
Morphological and ultrastructural observations in Electra pilosu (L.) and Membranipora membranacea (L.) show that the diaphragm which closes the tentacular atrium is formed by the juxtaposition of folds of the tentacle sheath around its apical sphincter and another row of folds of the vestibulum. Double desmosomes bind the epithelium and cuticle at the base of vestibular folds to the collagen layer of the sheath. The continuity of parietal and polypidian cellular layers during the morphogenesis of the aperture is discussed. Several cellular types are differentiated in the microvillous epithelium of the sheath at the edge of the atrial orifice. The sphincter is innervated by twin motor branches of the mixed peripheral nerves. An efferent cluster of axonal fibres arises from bipolar neurons which are vitally stained by methylene blue within every vestibular lobe, with a slender dendrite reaching to the cuticle. The ramified dendritic ending encloses the kinetosomes and aborted root of a vestigial cilium. Interdigitation of the dendritic ramifications and marginal vesicles of adjacent epithelial cells which also contain a single reduced cilium is observed, although no particular junction implying a functional couple was found. Vestibular folds around the atrial orifice are interpreted as sensory papillae with either a mechano- or chemoreceptive function.
- Publication
Zoologica Scripta, 1984, Vol 13, Issue 1, p59
- ISSN
0300-3256
- Publication type
Article
- DOI
10.1111/j.1463-6409.1984.tb00023.x