Vestibular System and Cerebellum - Stephens Flashcards
Dolls’s Eye Maneuver:
Head turns R, R eye adducts, L eye neutral
L CN 6 lesion
Dolls’s Eye Maneuver:
Head turns R, L eye abducts, R eye neutral
R CN 3 lesion
Dolls’s Eye Maneuver:
Head turns R, neither eye moves
Midbrain damage (deep coma)
Caloric testing:
Right ear stimulated, R eye abducts, L eye neutral
L CN 3 lesion
Caloric testing:
Right ear stimulated, L eye adducts, R eye neutral
R CN 6 lesion
Caloric testing:
Right ear stimulated, neither eye moves
R CN 8 lesion
OR
Midbrain damage (deep coma)
Placing/hopping reaction:
Standing on L foot, falls to the R
R vestibular system lesion
Symptoms of unilateral lesion of vestibular system
Eyes, head, body turn TOWARD lesion
Falls TOWARD lesion
Nystagmus (fast component) TOWARD lesion
Vertigo OPPOSITE the lesion
Tinnitus, violent vertigo attacks, vomiting, pallor, increased respiration
Meniere’s Disease - abnormal/excessive endolymph –> destruction of neuroepithelial cells in inner ear
Horizontal gaze to L, R eye neutral, L eye nystagmus
R INO (R MLF problem = fibers from abducens area to oculomotor nucleus (neutral MR) + descending fibers from oculomotor nucleus to abducens area (nystagmic LR))
Horizontal gaze to L, R eye neutral, L eye neutral
Horizontal gaze to R, R eye neutral, L eye neutral
Bilateral INO via MULTIPLE SCLEROSIS
CANNOT look to the L with either eye
Eyes naturally look slightly R
L PPRF lesion
ALL output from the cerebellum comes from the ______
Deep cerebellar nuclei
Function of cerebellar cortex
Turn down or attenuate motor activity to the appropriate amount for the desired motion (in response to posture, etc.)
Acoustic problems + vestibular problems (mass lesion)
Acoustic neuroma (etc.) of CN 8 (acoustic issues) compressing the adjacent cerebellar FLOCCULUS (vestibular issues)
