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Logan-Tri 1.Anatomy

Cranial Nerves

Cranial Nerves by NameCranial Nerves by NumberCranial Nerve TypeCranial Nerve FunctionLocation of Nuclei
Olfactory Nerve I Special Sensory Olfaction (smell) Arises as bipolar neurons from olfactory mucosa.
Optic Nerve II Special Sensory Vision Signals initiated by rods and cones of retina relayed by bipolar neurons to ganglion cells.
Oculomotor Nerve III Motor and Sensory Sup. Div.- Motor to Sup. Rectus(extrinsic eye muscle) and Levator Palpebrae Superioris(elevates the eyelid) Inf. Div.- Motor to Medial and Inf. Rectus and Inf. Oblique(3 extrinsic eye muscles); also provides parasympathetic innervation to iris and lens. Midbrain
Trochlear Nerve IV Motor and Sensory Motor fibers innervate the superior oblique muscle of eyeball (an extrinsic eye muscle). Midbrain
Trigeminal Nerve V Motor and Sensory This cranial nerve has 3 branches: Opthalmic Branch, Maxillary Branch and a Mandibular Branch. Has 3 branches: Opthalmic Branch, Maxillary Branch and a Mandibular Branch. Maxillary Branch provide motor input to muscles of mastication. Pons
Abducens Nerve VI Motor and Sensory Provides motor innervation to the lateral rectus to bring about abduction of the eyeball (turn it laterally). Pons
Facial Nerve VII Motor and Sensory Motor-Innervates the muscles of facial expression. •Parasympathetics- to lacrimal (secretions of tears), sublingual and submandibular glands (secretions of saliva). •Sensory-extends from taste buds in anterior 2/3rds of the tongue. Pons
Vestibulocochlear Nerve VIII Motor and Sensory Cochlear Branch-conveys nerve impulses associated with hearing arising in the spiral organ of Corti in the cochlea. ••Vestibular Branch-begins in the semicircular canals of inner ear. Transmits impulses related to equilibrium and balance. Pons (impulses related to hearing are in the medulla)
Glossopharyngeal Nerve IX Motor and Sensory Provides parasympathetic innervation to the parotid gland to mediate secretion of saliva. •Sensory fibers supply the pharynx and taste buds of the posterior 1/3rd of tongue. Medulla
Vagus Nerve X Motor and Sensory •Motor fibers-This cranial nerve generates visceral, cardiac and skeletal muscle movement. •Sensory fibers-mainly visceral sensory information from the same structures innervated by motor fibers. Medulla
Accessory Nerve XI Motor and Sensory •Originates from both the brain stem and spinal cord. •Supplies voluntary muscles of the pharynx, larynx and soft palate used for swallowing. •The spinal portion conveys motor impulses to the sternocleidomastoid and trapezius muscles. Medulla
Hypoglossal Nerve XII Motor and Sensory Motor-Supplies muscles of the tongue. Medulla
Created by: aholzer
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