Vestibular System

Question 1

Where does endolymph drain to for reabsorption?

Answer 1

Through the endolymphatic duct to the sigmoid sinus.

Question 2

Which organ is in the ampulla of semicircular ducts?

Answer 2

Cristae

Question 3

Which organ is in the utricle and saccule?

Answer 3

Maculae

Question 4

Which vestibular organ has hair cells in one direction? In two?

Answer 4

1-cristae, 2-maculae

Question 5

What kinds of movements does the cristae detect?

Answer 5

Angular acceleration in 3 orthogonal planes.

Question 6

Where are the cell bodies of the sensory axons activated by hair cells?

Answer 6

Vestibular (Scarpa’s) Ganglion, which give rise to the vestibular part of the vestibulocochlear N.

Question 7

Which nuclei are important for adaptations of the vestibular ocular reflex?

Answer 7

Floccuus and Fastisial nuclei. Also called the vestibulocerebellum

Question 8

What happens if there is damage to the projection from the vestibular complex to the thalamus?

Answer 8

Vertigo

Question 9

Where do first order neurons project from the vestibular system?

Answer 9

Vestibulocerebellum (flocculus and fastitial nuclei)

Question 10

Where do fibers from the cristae project?

Answer 10

Lateral, medial, and superior vestibular nuclei.