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Details Title: Vestibular System Description: Vestibular Flashcards Total Flash Cards: 33 Created: 04/17/2006 15:53:01	To study from this set of flash cards, or to create your own your own study flash cards, register HERE. If you are already a registered user, CLICK HERE.
Cards Term name the functions of the vestibular system Definition 1. balance, 2. monitor changes of position of the head, 3. coordinate eye movement with head movement, 4. coordinate limbs with head movement Term the osseos portion that is the "bucket" of the vestibular system Definition bony labyrinth Term canals arranged in 3 pairs at right angles. Definition semicircular canals Term the middle portion of the vestibular system Definition vestibule Term the "snail shell" which is responsible for hearing Definition cochlea Term the "water filled bag" within the "bucket"-filled with endolymph Definition membranous labyrinth Term fluid within the semicircular canal Definition semicircular duct Term fluid within the vestibule Definition utricle and saccule Term fluid within the cochlea Definition cochlear duct Term describe the hair cell Definition a receptor that projects off cells. stereocillia (short) and kinocilium (large) Term describe the function of the hair cells Definition detect changes in motion (rotory and linear) Term how do the hair cause function Definition the hair part is embedded in gel (otolithic membrane), when movement happens, gel moves and cause hairs to bend. this releases neurotransmitters to nerve fibers at the bases of cells. Term the name of the gel that embedds the hairs Definition otolithic membrane Term the receptors that are embedded in the cupula in each ampulla of the semicircular ducts Definition cristae ampullares Term function of the cristae ampullares Definition dynamic equilibrium, rotary movement (as head spins around) Term receptors that are embedded in the otolithic membrane of each utricle and saccule Definition maculae Term the function of the maculae Definition static equilibrium, linear acceleration Term where do the primary fibers of the vestibular system synapse Definition the vestibular nuclei, some go directly to the cerebellum Term where do the secondary fibers go Definition come from the vestibular nuclei, have efferent projections to the nervous system Term what is the fuction of the rostral vestibular nuclei Definition predominantly projects to the extraocular nuclei of CN 3, 4, 6. Term what is the function of the caudal vestibular nuclei Definition project toward the cerebellum Term what is the function of the later vestibular nuclei Definition project toward the spinal chord, regulate muscle tone/balance. Term what is the function of the medial vestibular nuclei Definition project toward the spinal chord, cervical musculature-positions neck in relation to change Term what is the function of the lateral vestibulospinal tract Definition 1. facillitate ipsilateral extensor muscle tone, 2. regulate muscle tone/balance Term what is the function of the medial vestibulospinal tract Definition go to the cervical muscles from the medial nuclei Term what is the function of the extraocular nuclei Definition (3, 4, 6)-keep eyes stationary as head moves, conjugate eye movements Term function of the vomition center Definition spining stimulates receptors that go to the up chuck center Term what is the function of the vestibulospinal tract Definition seconary: enter floculonodular lobe, primary: directly to cerebellum to the fastigial nucleus Term What are the branches of the medial longitudinal fasciculus Definition ascending branch, decending branch Term the function of the ascending branch of the longitudinal fasciculus Definition go rostrally, provide vestibular info to the eyes (3, 4, 6)-form vestibulomesencephalic tract Term what is the function of the descending branch of the medial longitudinal fasciculus Definition go to caudal spinal chord, regulate extensor tone, form mediovestibulospinal tract Term posture signs of vestibular disease Definition 1. asymmetric ataxia, 2. head tilt, 3. curved trunk, 4. tip, fall, roll over, 5. circling Term eye signs of vestibular disease Definition 1. nystagmus-involuntary ossilation of eyes