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The cranial nerves

Cranial nerves function and testing

NerveMotor or sensoryTesting
I Olfactory Sensory Use familiar scents
II Optic Sensory Visual acuity and visual field
III Oculomotor Motor: eye movements, pupil constriction Sensory: proprioception Pupillary reflex, tracking
IV Trochlear Motor: movement of eye Sensory: proprioception Downward and lateral movment of eye, superior oblique
V Trigeminal Motor: mastication Sensory: sensation for pain, touch, pressure, temperature. Decasates at the Pons. Primary sensory nerve to face and tongue. There are three branches: opthalimic, maxillary, mandibular Motor: palpate masseter Sensory: lightly stroke face
VI Abducens Motor: movement of eye Sensory: proprioception Lateral movement of eye and lateral rectus muscle
VII Facial Motor: facial expression, glandular secretion Sensory: taste for anterior 2/3 tongue. If there is damage you will get mask like apperence with minimal or no facial expressions. This nerve decasates at the Pons check symmetry of facial muscles, check taste for anterior 2/3 tongue
VIII Vestibulocochlear Sensory Cochlear: hearing Vestibular: equilibrium Cochlear: tuning fork Vestibular: REM and loss of balance
IX Glossopharyngeal Motor: swallowing/secretion of saliva Sensory: taste for posterior 1/3 tonge. Decasates at the medulla. provides some sensory infor for parts of the ear and senory and motor for the pharynx. Damage would effect swallowing and loss of tast Motor: gag reflex, say "ah" Sensory: test for bitters
X Vagus Motor: somatic control of speech, visceral control of smooth muscle Sensory: impulses from viscera. Decassates at the meduella. There are two branches, the superior and inferior. Known as the "wandering" nerver- effects the larynx, lungs and esophogus. Ability to speak/swallow. Effects mm of velum
XI Accessory (spinal) Motor: swallowing and movement of head Sensory: proprioception. effects levator veli palatini and uvula and SCM Turn head against resistance
XII Hypoglossal. Crosses at medulla Motor: movment of tongue during speech and swallowing Sensory: proprioception. Damage would effect the tongue. protrude tongue, articulation of words
Created by: mmason