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Vestibular System

Vestibular System- Neuro Test 2

Sound waves move _________ ________. The Tympanic Membrane
The Tympanic membrane moves _________. Ossicles
Motion at the _____ window moves ___________________. 1. Oval Window 2. Fluid in the Cochlea
Movement of __________ & __________ in the _________ causes a response in _________ neurons. 1. Fluid & Stereocilia in the Cochlea 2. Sensory
Once a neural response to a sound is generated in the _______ ______, the signal is transferred to & processed by ___________________. This includes the _____________. 1. Inner ear 2. A series of nuclei in the brain stem 3. Inferior Colliculus
After this neural response, OUTPUT is sent to a ______ in the _________. To a relay in the Thalamus
The relay from this output is called __________________. Medial Geniculate Nucleus (MGN)
MGN projects to ____________________ in the ____________. 1. Primary Auditory Cortex in the TEMPORAL LOBE
The air in the ______________ is continuous with the air in the ________________ via the ___________________. 1. Middle Ear 2. Nasal Cavities 3. VIA THE Eustachian Tube
The Vestibular System is responsible for _________ & _________ of the __________. Gives us our sense of _____________ & ____________ , helps coordinate ____________ of the __________ & _______ and finally helps with ___________ to _________ ________. 1. Position & Movement of the head 2. Sense of Balance & Equilibrium 3. Coordinates movements of the HEAD & EYES 4. Helps with adjustments to BODY POSTURE
The Vestibular Labyrinth includes __ types of structures. Name all. 2 - The Otolith Organs & The semicircular canals
The Otolith organs are responsible for what 2 functions? 1. Detect the force of gravity 2. Tilts of the head
The Semicircular canals are sensitive to ________________. Head Rotation
The otolith organs and semicircular canals are structures of what? The Vestibular Labyrinth
The Otolith organs are a pair of large ___________. Chambers
What are the name of the Otolith chambers and where are they located? 1. The Saccule 2. The Utricle Located near the CENTER of the Labyrinth.
The semicircular canals are the __ arcing structures of the ________. There is about a ___ degree angle between any pair 3 Labyrinth 90 Degree angle
Each hair cell of the vestibular organs makes an _______ _______ with the end of a __________ axon from the _____________ nerve. 1. Excitatory Synapse 2. Sensory axon 3. Vestibular nerve
The vestibular nerve is a branch of what nerve? Cranial nerve VIII, Vestibulocochlear nerve
There are about _____________ vestibular nerve axons on each side of the head. Their cell bodies lie where? 20,000 The cell bodies lie in SCARPA'S GANGLION
What is Scarpa's ganglion? An area where cell bodies of vestibular nerve lie in.
The central vestibular pathways coordinate & integrate information about __________ & ________ _____________. Head & Body movement
The central vestibular pathways use the movement of head and body to control the _______ of __________ ________ that adjust _____, ______ & ________ _________. 1. Output of Motor Neurons 2. Adjust the head, eye and body positions
Primary Vestibular Axons come from what? Cranial nerve VIII
The Primary Vestibular axons make direct connections to the _________ ________ on the ______ ______ of the __________ + _________. 1. Vestibular nucleus 2. Same side of the BRAINSTEM + CEREBELLUM
Vestibular Nuclei also receive inputs from: __________________. The cerebellum + Visual/Somatic Sensory systems
The Vestibular nucleus has several ___________. Subdivisions
With these several subdivisions, the vestibular nucleus PROJECTS to a variety of targets where? - ABOVE to the brainstem - BELOW to the spinal cord
Axons from the Otolith Organs project to ____________________. This then projects via the _____________ tract, exciting _______________. 1. Lateral Vestibular Nucleus 2. Vestibulospinal Tract 3. Spinal/Motor Neurons
These Spinal/Motor neurons control ____________________ that help _____________. Muscles in the Legs that help maintain POSTURE.
This vestibulospinal pathway helps the body ______________. Maintain posture (even on the rolling deck of a boat)
Vestibular nuclei send axons where? This projects to regions close to the representation of the _____ in the ___________________ & _______________ of the ________. Into the VP (ventral-posterior) nucleus of the thalamus. 1. Face 2. In the Primary Somatosensory & Primary Motor areas of the Cortex
What keeps your eyes pointed in a particular direction even while your head and body is moving? Vestibulo-ocular Reflex (VOR)
VOR works by sensing __________ of the _______. It immediately commands a __________ of the eyes in the _________ _______. 1. Rotations of the head 2. Compensatory movement of the eyes in the opposite direction
Created by: 30315474
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