oculomotor nerve
oculomotor nerve
oculomotor nerve
oculomo′tor nerve`
n.
| Noun | 1. |  oculomotor nerve - supplies extrinsic muscles of the eye |
| 单词 | oculomotor nerve | |||
| 释义 | oculomotor nerveoculomotor nerveoculomotor nerveoculomo′tor nerve`n.
oculomotor nerveoculomotor nerve[¦äk·yə·lō′mōd·ər ′nərv]oculomotor nerveoculomotor[ok″u-lo-mo´tor]oculomotor nerveoculomotor nerveThe third of the paired cranial nerves arising directly from the brainstem. This nerve supplies four of the six small muscles that move the eye, the muscle that elevates the upper lid and the circular muscles of the iris. Paralysis of an oculomotor nerve causes the pupil to be enlarged, the lid to droop and the eye to be unable to turn inwards.oculomotor nervethe third cranial nerve of vertebrates, that innervates the muscles which move the eyeball.nucleusabducens nucleus Nucleus of the abducens nerve (sixth cranial nerve) located in the lower part of the pons and whose axons supply the lateral rectus muscle. accessory oculomotor nucleus See Edinger-Westphal nucleus. nucleus of the crystalline lens See crystalline lens. Edinger-Westphal nucleus Part of the oculomotor nucleus, it is situated posterior to the main nucleus and contains the parasympathetic component of the complex. Axons from the Edinger-Westphal pass out along the third (or oculomotor) nerve to synapse in the ciliary ganglion. Postganglionic fibres pass through the short ciliary nerves to the sphincter pupillae and ciliary muscles. The nucleus also receives fibres concerned with accommodation and fibres from the pretectal nucleus dealing with pupil light reflexes. Syn. accessory oculomotor nucleus; accessory parasympathetic nucleus. See pretectal nucleus; pupil light reflex. lateral nucleus Part of the oculomotor nucleus which supplies, via the oculomotor nerve, all the extraocular muscles except the superior oblique and the lateral rectus muscles. lateral geniculate nucleus See lateral geniculate body. oculomotor nucleus This is the nucleus of the oculomotor nerve (third cranial nerve). It is a complex mass of cells located in the midbrain at the level of the superior colliculus and beneath the cerebral aqueduct (of Sylvius) which connects the third and fourth ventricles. It is divided into several subnuclei. See oculomotor nerve; Edinger-Westphal nucleus; Perlia's nucleus; trochlear nucleus. olivary nucleus See pretectum; pupil light reflex. Perlia's nucleus Midline part of the oculomotor nucleus. It is rudimentary in man and primates and may provide part of the innervation of the superior rectus muscle. pretectal nucleus A complex group of nerve cells in the midbrain anterior to the superior colliculi. One of these, the pretectal olivary nucleus, receives retinal inputs via the optic tract and superior brachium and sends axons to both Edinger-Westphal nuclei. It constitutes a centre of the pupil light reflex. Another, the nucleus of the optic tract, may be involved in the control of reflex eye movements. Other fibres from the pretectal nucleus innervate the cornea, the iris, the ciliary muscle and the extraocular muscles (except the lateral rectus and superior oblique muscles), as well as the levator palpebrae muscle. trochlear nucleus A nucleus of the trochlear nerve (fourth cranial nerve) located at the level of the inferior colliculus and below the posterior end of the oculomotor nerve nucleus, it sends fibres to the contralateral superior oblique muscle. oculomotor nerve
Synonyms for oculomotor nerve
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