Extraocular Muscles in the Lamprey, &lt;i&gt;Lampetra fluviatilis&lt;/i&gt; L.

Witaliński, Wojciech; Łabuda, Halina

doi:10.1159/000145588

Cited by 9 publications

(1 citation statement)

References 20 publications

(29 reference statements)

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“…Recent studies on lamprey extraocular muscle distinguish either two (Nakado & Aoki 1982) or three (Witalinski & Labuda 1982) types of fibres . In Carassius and Rana, Kilar-sky & Bigaj (1969) have shown two functionally different categories of fibres in the extraocular muscles : red or slow (S fibres) and white or fast (FF fibres) .…”

Section: Discussionmentioning

confidence: 99%

The eye muscles and their innervation inChaetodon trifasciatus (Pisces, Teleostei, Chaetodontidae)

Bauchot

Thomot

Bauchot³

1989

Environ Biol Fish

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SynopsisIn 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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Section: Discussionmentioning

confidence: 99%

The eye muscles and their innervation inChaetodon trifasciatus (Pisces, Teleostei, Chaetodontidae)

Bauchot

Thomot

Bauchot³

1989

Environ Biol Fish

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Organization of the six motor nuclei innervating the ocular muscles in lamprey

Fritzsch

Sonntag

Dubuc

et al. 1990

J of Comparative Neurology

100

131

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The topography of motoneurons supplying each of the six ocular muscles of the lamprey, Lampetra fluviatilis, was studied by selective application of HRP to the cut nerves of identified muscles. In addition, the distributions of motoneuron populations to both eyes were studied simultaneously with fluorescein and rhodamine coupled dextran-amines (FDA and RDA) applied to cut ocular muscle nerves of either side. The motoneuron pool of the caudal oblique muscle is represented bilaterally in the trochlear (N IV) motor nucleus. The dorsal rectus muscle is innervated from a contralateral group of oculomotor (N III) motoneurons and the remaining four muscles exclusively from the ipsilateral side (N III and N VI). The inferior and posterior rectus muscles are both innervated by the abducens nerve. In contrast to all jawed vertebrates, only three eye muscles (the dorsal rectus, rostral rectus, and rostral oblique) are innervated by the oculomotor nerve in lampreys (N III). Lampreys have a motor nucleus similar to the accessory abducens nucleus previously described only in tetrapods. They lack the muscle homologous to the nasal rectus muscle of elasmobranchs and the medial rectus muscle of osteognathostomes. The distribution of the dendrites of different groups of motoneurons was studied and is considered in relation to inputs from tectum and the different cranial nerves.

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