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Excerpt from Extraocular Muscles, AnatomySynonyms, Key Words, and Related Terms: eye movement, adduction, abduction, vertical rectus muscle, horizontal rectus muscle, lateral rectus muscle, medial rectus muscle, superior rectus muscle, inferior rectus muscle, superior oblique muscle, inferior oblique muscle, strabismus, gaze position Please click here to view the full topic text: Extraocular Muscles, AnatomyThe upper division of the oculomotor nerve (cranial nerve III) innervates the superior rectus and the levator palpebrae superioris muscles. The lower division of cranial nerve III innervates the inferior rectus, medial rectus, and inferior oblique muscles. The nerve to the inferior oblique muscle enters the muscle laterally at the junction of the inferior oblique and inferior rectus muscles.The trochlear nerve (cranial nerve IV) innervates the superior oblique muscle. The nerve to the superior oblique muscle enters the muscle approximately one third of the distance from the origin to the trochlea. The abducens nerve (cranial nerve VI) innervates the lateral rectus muscle. The parasympathetic innervation to the pupillary sphincter and ciliary muscle travels with the nerve to the inferior oblique muscle. The parasympathetics may be injured during inferior oblique surgery or orbital floor surgery. All other nerves enter their respective muscle at the junction of the posterior one third and anterior two thirds of the muscle Please click here to view the full topic text: Extraocular Muscles, Anatomy |
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