Lesion Local 3 Flashcards
Oculomotor nerve
Originates in the midbrain
Innervates the dorsal, medial & lateral rectus & ventral oblique muscle
Provides parasympathetic innervation to internal ocular muscles (pupillary sphincter muscle)
Trochlear nerve
Originates in the midbrain
Originates from dorsal aspect of midbrain **
Innervates dorsal oblique muscle
Abducense nerve
Originates in medulla
Innervates lateral rectus and retractor bulbi
Cranial nerves for eyes
III, IV, VI
Ventrolateral strabismus
Caused by a lesion on the Occulomotor nerve
Rotational strabismus
Lesion on the trochlear nerve
Medial strabismus
A lesion localized to the abducens nerve
Afferent trigeminal
5th
Medial canthus or cornea = ophthalmic branch 5
Palpebral reflex
Corneal reflex
Efferent info - facial 7CN
Retractor bulbi = 6thCN
Assessing for blink and behavioral response
Facial nerve VII
Originates is medulla
Motor to muscles of facial expression
Sensory to the internal pinnae
Parasympathetic for lacrimal gland
assessing facial nerve
Lack of menace or palpebral
Facial dropping
Lack of sensation to inner pinnae
Neurogenic keratoconjunctivitis sicca
Vestibulocochlear nerve VIII - sensory
Originates from medulla
Vestibular portion
Cochlear portion
Vestibular portion of VIIICN
Maintains posture & balance relative to the head, body and limbs
Detects acceleration and deceleration
Coordinates eye movement - normal eye position
Vestibular clinical signs
Abnormal posture
Vestibular ataxia
Strabismus
Nystagmus - abnormal eye movement
Cranial nerves IX, X, XI
All originate from caudal medulla and share functions
Innervate oropharynx, larynxm, esophagus