The membranous labyrinth and its innervation inChaetodon trifasciatus (Pisces,Teleostei, Chaetodontidae) |
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Authors: | Roland Bauchot Athanase Thomot Marie-Louise Bauchot |
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Institution: | (1) Laboratoire d'Anatomie comparée, Université Paris VII, 2 Place Jussieu, 75251 Paris Cedex 05, France;(2) Laboratoire d'Ichthyologie générale et appliquée, Muséum National d'Histoire Naturelle, 57 rue Cuvier, 75231 Paris Cedex 05, France |
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Abstract: | Synopsis In the butterflyfishChaetodon trifasciatus, the labyrinth is characterized by its elevated form and especially the size of the vertical canals, the almost circular
form of the horizontal canal and its posterior opening not directly in the utriculus but in the common pillar of the two vertical
canals. There is an almost complete separation between utriculus and sacculus which are only linked by a virtual pore. The
lagena, which is medially situated to the posterior part of the sacculus, is separated from it by an incomplete vertical wall.
There are two maculae neglectae, the anterior macula being situated in the pore separating utriculus from sacculus and filling
this pore, the posterior in a gutter of the floor of the utriculus. A long and narrow endolymphatic canal, originating from
the sacculus close to the communication with the utriculus, follows the common pillar of the two vertical canals and widens
into an endolymphatic sac at the top of the membranous labyrinth. The innervation of the labyrinth is made by the acoustic
ganglion, which is connected to the brain by two roots and elongated into three parts: the anterior part innervates the anterior
and horizontal cristae and the utricular and saccular maculae; the middle part innervates the macula sacculae and the macula
neglecta 1; the posterior part innervates the macula neglecta II, the macula lagenae and the posterior crista. The important
size of the vertical canals and the almost circular form of the horizontal canal may reflect very precise locomotory aptitudes. |
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Keywords: | Butterflyfish Two maculae neglectae Saccus endolymphaticus Acoustic ganglion |
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