Exam 3: Vestibular System Flashcards
What are the components and the receptor organ of the inner ear for sound?
Organ of corti- cochlear
What are the components and the receptor organa of the inner ear for movement?
Semicircular canals- crista ampullaris
Utricle- macula
Saccule- macula
What are the descending tracts from the vestibular nuclei? What clinical signs do they cause with disease in the vestibular system?
Medial vestibulospinal tract– causes head tilt
Lateral vestibulospinal tract– causes falling over
What are the ascending tracts from the vestibular nuclei? What clinical signs do they cause with disease in the vestibular system?
Medial longitudinal fasciculus– causes nystagmus
Which nystagmus is considered normal, physiologic or pathologic?
Physiologic
Which nystagmus is considered normal, pendular or jerk?
Pendular
Which nystagmus is considered normal, spontaneous or positional?
Neither, both are pathologic
What are the signs of vestibular disease?
Head tilt
Falling
Circling
Nystagmus
What signs are added to the typical signs of vestibular disease for peripheral vestibular disease? Where does this mean the lesion is?
CN 7 deficits and Horner’s syndrome
Inner middle ear
What signs are added to the typical signs of vestibular disease for central vestibular disease? Where does this mean the lesion is?
Postural reaction deficits
Brainstem/cerebellum
Your patient has a head tilt to the right, circling to the right, and fast phase nystagmus to the left, but the postural reaction deficits are on the left. Where is the lesion?
Left, cerebellum
Your patient has a head tilt to the right, circling to the right, and nystagmus fast phase to the left. Is the patient central or peripheral vestibular syndrome?
Can’t tell
Your patient has a head tilt to the left, circling to the left, nystagmus fast phase to the right, Horner’s syndrome in the left eye. Where is the lesion? What is affected to create the Horner’s syndrome?
Left, peripheral
Sympathetic nerve
Your patient has a head tilt to the right, circling to the right, nystagmus fast phase to the left, right sided postural reaction deficits, and right sided facial nerve paralysis. Where is the lesion?
Right, central
