Vestibular System Flashcards
the utricle and saccule are involved in
static equilibrium, upright posture, linear acceleration
how are hair cells activated in the utricle and saccule
the hairs embedded in calcified gel bent by gravity
what structure is sensitive to head tilt from upright position
utricle
what structure is sensitive to head tilt from sideways position
saccule
semicircular canals are involved in
dynamic equilibrium and coordination
semicircular canals are especially sensitive to
accelleration and rotation
what are the 3 canals of the semicircular canals?
anterior, posterior, lateral (3 planes)
where are the hair cells in the semicircular canals location
in ampulla
how are hair cells triggered in the ampulla of the semicircular canals
hairs are embedded in gel (cupula) and are bent by movement of endolymph in canal
the vestibular ganglion primary afferents (CN VIII) join with cochlear afferents and then synapse in:
vestibular nuclear complex
what is the vestibular nuclear complex, and where is it located?
four groups of neurons in rostral medulla and caudal pons
list 3 reflex systems for motor control
- vestibulo-spinal
- vestibulo-ocular
- vestibulo-cerebellar
vestibulospinal
descending postral control of spinal cord motor neurons (medial and lateral components)
vestibulo-ocular travels via
the medial longitudinal fasciculus
vestibulo-ocular function
primary director of ocular movements
