Exam 1 (Lecture 7) - Medulla 2

Question 1

What are the components of the vestibulocochlear nerve?

Answer 1

1) Vestibular
- afferent fibers from vestibular organ
- eye movement in response to change in head position
- adjust body position in response to change in head position

2) Cochlear
- Afferent fibers from cochlea (sound sensory organ)
- Auditory input

Question 2

What are the auditory structures present in the medulla?

Answer 2

1) Cochlear nuclei
2) Acoustic stria
3) Trapezoid body

Question 3

What clinical signs would you expect to see with a lesion of the vestibular system?

Answer 3

1) Abnormal nystagmus
- oscillating eye movement when head is still
- slow phase
- quick phase (designates direction)
- away from lesion

2) Head tilt
- toward lesion

3) Walking in circle
- toward lesion