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