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Cranial nerves
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12
Physiology
05/11/2011

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Term
Olfactory Nerve (I)
Definition
Purely sensory, carries afferent impulses for sense of smell
Term
Optic Nerve (II)
Definition
Purely sensory, carries afferent impulses for vision
Term
Oculomotor nerve (III)
Definition
Controls some extrinsic eye muscles, helps move eyeball, raises eyelid, causes constriction of iris
Term
Trochlear nerve (IV)
Definition
Primarily motor nerves, controls some extrinsic eye muscles and the superior oblique muscle
Term
Trigeminal Nerve (V)
Definition
Largest cranial nerve, transmits afferent impulses from touch, temperature, pain receptors, contains some motor fibers that innervate chewing muscles
Term
Abducens Nerve (VI)
Definition
Primarily motor, supplies somatic motor fibers to lateral rectus muscle, an extrinsic eye muscle, and conveys proprioceptor impulses from the same muscle to the brain
Term
Facial Nerve (VII)
Definition
Conveys motor impulses to skeletal muscles of the face, transmits motor impulses to tear glands, nasal gland, and salivary glands, conveys sensory impulses from the anterior 2/3 of the tongue
Term
Vestibulocochlear Nerve (VIII)
Definition
Purely sensory, transmits impulses for sense of equilibrium and sense of hearing
Term
Glossopharyngeal Nerve (IX)
Definition
Conducts taste and sensory impulses from pharynx and posterior tongue
Term
Vagus Nerve (X)
Definition
Most motor fibers are parasympathetic efferents, except those that serve skeletal muscles involved in swallowing. Transmits impulses from thoracic and abdominal viscera, carotid sinus, taste buds in the pharynx, and aortic bodies
Term
Accessory Nerve (XI)
Definition
Mostly motor in function. Supplies motor fibers to larynx, pharynx and soft palate, trapezius and sternocleidomastoid muscles, which move the head and neck
Term
Hypoglossal Nerve (XII)
Definition
Carries somatic motor fibers to intrinsic and extrinsic muscles of tongue. Allows food mixing and manipulation by the tongue and tongue movements involved in swallowing and speech