The eye muscles and their 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 appliqueé, Muséum National d'Histoire Naturelle, 57 rue Cuvier, 75231 Paris Cedex 05, France |
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Abstract: | Synopsis InChaetodon trifasciatus, the large eye has the form of a thick disk rather than that of a globe. A deep cutaneous groove surrounds the eyeball, probably
allowing rapid eye movements. The form and innervation of the three pairs of extraocular muscles are described. Each muscle
is made of two types of fascicles of fibres, thick and thin. There is neither an anterior nor posterior myodome. The skull
attachment of the obliques and of the inferior rectus is made on the thin sagittal ethmoidal membranous septum while that
of the other recti occurs on osseous pieces of the skull. The attachment on the eyeball is made on the cartilaginous sclera.
The ratio of the lengths of the antagonist muscles, superior vs. inferior oblique, superior vs. inferior rectus and medial
vs. lateral rectus, is about 1.43:1. The three oculomotor nerves (III: common oculomotor, IV: trochlear and VI: abducens)
as well as the ciliary system are described. For the following reasons, an analogy between the lateral rectus ofChaetodon trifasciatus and the lateral rectus + retractor bulbi of other vertebrates is indicated: (1) the nucleus of nerve III (which innervates
four muscles) has four sectors, while that of IV (which innervates only the superior oblique) is made of one sector; (2) nerve
VI consists of two roots corresponding to two groups of nerve cells of its motor nucleus and (3) in other vertebrates, nerve
VI innervates both the lateral rectus and the retractor bulbi. |
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Keywords: | Extraocular muscles Oculomotor nerves Eye movements Butterflyfishes |
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