Synopsis
In Chaetodon 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 of Chaetodon 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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Bauchot, R., Thomot, A., Bauchot, ML. (1989). The eye muscles and their innervation in Chaetodon trifasciatus (Pisces, Teleostei, Chaetodontidae). In: Motta, P.J. (eds) The butterflyfishes: success on the coral reef. Developments in environmental biology of fishes, vol 9. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-2325-6_17
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DOI: https://doi.org/10.1007/978-94-009-2325-6_17
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