Lecture+19+The+Peripheral+Nervous+System+Part+II

Trochlear nerve iv motor fibers originate in cells of

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Trochlear nerve (IV) Motor fibers originate in cells of the midbrain and extend to the superior oblique muscles of the eye. Also contains afferent fibers from proprioceptors in the superior oblique muscles of the eye. Cranial Nerves 11 Sunday, June 12, 2011
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Trigeminal nerve (V) Has three branches: ophthalmic nerve, maxillary nerve, and mandibular nerve. Sensory neurons carry afferent impulses from skin and mucosa of head and teeth to cell bodies in the trigeminal ganglion. Motor fibers originate in trifacial motor nucleus and extend to the muscles of mastication through the mandibular nerve. Abducens nerve (VI) Motor nerve with fibers originating from a nucleus in the pons on the floor of the fourth ventricle and extending to the lateral rectus muscles of the eye. Contains afferent fibers from proprioceptors in the lateral rectus muscles. Cranial Nerves 12 Sunday, June 12, 2011
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Facial nerve (VII) Motor fibers originate from a nucleus in the lower part of the pons and extend to superficial muscles of the face and scalp Autonomic fibers extend to submaxillary and sublingual salivary glands. Also contains sensory fibers from taste buds of anterior two thirds of the tongue. Vestibulocochlear nerve (VIII) Two distinct divisions that are both sensory: vestibular nerve and cochlear nerve: Vestibular nerve fibers originate in the semicircular canals in inner ear and transmit impulses that result in sensations of equilibrium. Cochlear nerve fibers originate in the organ of Corti in the cochlea of the inner ear and transmit impulses that result in sensations of hearing.
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  • Fall '11
  • MarcinBaranowski
  • Physiology, Anatomy, Motor nerve, Accessory nerve, Facial nerve, vestibular nerve

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