|l'Innervation de l'aviculaire pédonculé des Bicellariidae (bryozoaires chilostomes) = Innervation of the avicularium in Bicellariidae|
Lutaud, G. (1977). l'Innervation de l'aviculaire pédonculé des Bicellariidae (bryozoaires chilostomes) = Innervation of the avicularium in Bicellariidae. Cah. Biol. Mar. 18(4): 435-448
In: Cahiers de Biologie Marine. Station Biologique de Roscoff: Paris. ISSN 0007-9723, more
The nervous pathways in the pedunculate avicularium have been vitally stained with methylene blue in several species of the genus Bugula. The patterns of innervation are similar in the avicularium and in the autozooid. Avicularian nerves arise from the ganglion located in the median region of the ciliated body which is the reduced homologue of a polypide. In the anterior region which corresponds to an aborted lophophore, short nerve fibers, arising from a rudimentary peripharyngial belt, bear special cells in the epithelium at the base of the cilia which emerge through the orifice. The main nerves of the avicularium are the homologues of the great nerves of the tentacle sheath in the autozooid. They ramify into motor branches joining the muscles of the mandible and the parietal muscles, and non motor branches joining the reduced frontal area beneath the hinge of the mandible, the internal surface of the mandible, the palate and the wall. A delicate network made by the ramified prolongation of large stellate cells is electively stained by methylene blue in the calcified wall of the skull. This network spreads into the wall from a ramification of the main parietal nerve. No evidence of any nervous bond between the autozooid and the adjacent avicularium has been demonstrated so far. However, strands stained by methylene blue are observed in the partitions of Bugula simplex and Bicellariella ciliata.