Stemit

07.05.2018 3 Comments

Inferior branch[ edit ] The inferior branch of the oculomotor nerve or the inferior division, the larger, divides into three branches. From the red nucleus fibers then pass via the substantia nigra exiting through the interpeduncular fossa. There are two nuclei for the oculomotor nerve: The oculomotor nucleus originates at the level of the superior colliculus. From the ciliary ganglion post ganglionic fibers pass through the short ciliary nerve to the constrictor pupillae of the iris and the cilliary muscles. On emerging from the brainstem , the nerve is invested with a sheath of pia mater , and enclosed in a prolongation from the arachnoid. Another, to the inferior rectus. It traverses the cavernous sinus , above the other orbital nerves receiving in its course one or two filaments from the cavernous plexus of the sympathetic nervous system, and a communicating branch from the ophthalmic division of the trigeminal nerve. Sympathetic postganglionic fibres also join the nerve from the plexus on the internal carotid artery in the wall of the cavernous sinus and are distributed through the nerve, e.

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The third nerve nucleus is located ventral to the cerebral aqueduct , on the pre-aqueductal grey matter. Function[ edit ] The oculomotor nerve include axons of type GSE, general somatic efferent , which innervate skeletal muscle of the levator palpebrae superioris, superior rectus, medial rectus, inferior rectus, and inferior oblique muscles. Another, to the inferior rectus. All these branches enter the muscles on their ocular surfaces, with the exception of the nerve to the inferior oblique, which enters the muscle at its posterior border. The muscles it controls are the striated muscle in levator palpebrae superioris and all extraocular muscles except for the superior oblique muscle and the lateral rectus muscle. The third and longest runs forward between the inferior recti and lateralis to the inferior oblique. On emerging from the brainstem , the nerve is invested with a sheath of pia mater , and enclosed in a prolongation from the arachnoid. Inferior branch[ edit ] The inferior branch of the oculomotor nerve or the inferior division, the larger, divides into three branches. There are two nuclei for the oculomotor nerve: One passes beneath the optic nerve to the medial rectus. Structure[ edit ] The oculomotor nerve originates from the third nerve nucleus at the level of the superior colliculus in the midbrain. From the red nucleus fibers then pass via the substantia nigra exiting through the interpeduncular fossa. From the ciliary ganglion post ganglionic fibers pass through the short ciliary nerve to the constrictor pupillae of the iris and the cilliary muscles. It traverses the cavernous sinus , above the other orbital nerves receiving in its course one or two filaments from the cavernous plexus of the sympathetic nervous system, and a communicating branch from the ophthalmic division of the trigeminal nerve. The nerve also includes axons of type GVE, general visceral efferent , which provide preganglionic parasympathetics to the ciliary ganglion. The Edinger-Westphal nucleus supplies parasympathetic fibers to the eye via the ciliary ganglion , and thus controls the sphincter pupillae muscle affecting pupil constriction and the ciliary muscle affecting accommodation. It supplies the superior rectus and levator palpebrae superioris. The fibers from the two third nerve nuclei located laterally on either side of the cerebral aqueduct then pass through the red nucleus. As the oculomotor nerve enters the orbit it divides into a superior and an inferior branch, which enter the orbit through the superior orbital fissure. It passes between the superior cerebellar below and posterior cerebral arteries above , and then pierces the dura mater anterior and lateral to the posterior clinoid process , passing between the free and attached borders of the tentorium cerebelli. From the last a short thick branch is given off to the lower part of the ciliary ganglion , and forms its short root. Sympathetic postganglionic fibres also join the nerve from the plexus on the internal carotid artery in the wall of the cavernous sinus and are distributed through the nerve, e. The oculomotor nucleus originates at the level of the superior colliculus.

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3 thoughts on “Stemit”

  1. On emerging from the brainstem , the nerve is invested with a sheath of pia mater , and enclosed in a prolongation from the arachnoid.

  2. The fibers from the two third nerve nuclei located laterally on either side of the cerebral aqueduct then pass through the red nucleus. On emerging from the brainstem , the nerve is invested with a sheath of pia mater , and enclosed in a prolongation from the arachnoid.

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