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17 Cards in this Set

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What do the semicircular canals contain?
They contain the cristae
What do the semicircular canals respond to? Via what?
They respond to angular acceleration via crista, which are modified hair cells that detect movement of the endolymph.
What does the saccule contain?
It contains the macula.
What does the saccule respond to? Via what?
It responds to up and down motion via the macula which have modified hair cells.
What does the utricle contain?
It contains maculae.
What does the utricle respond to? Via what?
It responds to horizontal/linear acceleration via the maculae (modified hair cells).
What do the semicircular canals project to?
The superior and rostral part of the medial nucleus.
What does the utricle project to?
The lateral part of the medial nucleus and the medial part of the inferior nucleus and the inferior part of the superior nucleus.
What does the saccule project to?
It projects to the lateral portion of the inferior nucleus.
What are the ascending bifurcations of the primary vestibular fibers?
Superior, medial, and lateral nuclei.
When the CN8 splits and descends, what does it insert into?
The inferior and caudal part of the medial nucleus.
After synapsing in the primary vestibular nuclei, where do the secondary projections go?
They go to the cerebellum, motor cranial nuclei, and the spinal cord. (S(C)nM)
Are the projections of the vestibulocerebellar nerve more numerous than the vestibular nerve itself?
Yes. They go to the cortex of the nodulus, uvula, folcculus, and to the fastigial nuclei.
What kind of projections does the vestibular nuclei send to the MLF?
Cross and uncrossed that then ascend and descend in the MLF.
What component controls the head and neck muscles for walking and movement of the head to coordinate it with eye movement?
The medial vestibulospinal projections (via both sides of the MLF)
What conveys information for the extensor muscles (Tone and reflexes) for posture/antigravity?
The lateral vestibulospinal tract.
What controls the flexors of spinal reflexes and tone?
The rubrospinal tract.