Kinesthetic and Vestibular Senses (6A) - MCAT Psychological and Social Foundations
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What is the name of the gelatinous structure that hair cell stereocilia embed in within semicircular canals?
What is the name of the gelatinous structure that hair cell stereocilia embed in within semicircular canals?
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Cupula. Endolymph movement deflects this structure during rotation.
Cupula. Endolymph movement deflects this structure during rotation.
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What is the role of otoconia (otoliths) in the utricle and saccule?
What is the role of otoconia (otoliths) in the utricle and saccule?
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Add inertia to deflect hair cells during linear acceleration/tilt. Calcium carbonate crystals provide mass for detecting acceleration.
Add inertia to deflect hair cells during linear acceleration/tilt. Calcium carbonate crystals provide mass for detecting acceleration.
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Identify the correct match: semicircular canals detect _____; otolith organs detect _____.
Identify the correct match: semicircular canals detect _____; otolith organs detect _____.
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Angular acceleration; linear acceleration and head tilt (gravity). Canals sense rotation; otoliths sense straight-line motion and gravity.
Angular acceleration; linear acceleration and head tilt (gravity). Canals sense rotation; otoliths sense straight-line motion and gravity.
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Identify the sensory deficit: a patient cannot tell finger position with eyes closed; which sense is impaired?
Identify the sensory deficit: a patient cannot tell finger position with eyes closed; which sense is impaired?
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Proprioception (kinesthetic sense). Loss of position sense indicates damaged muscle/joint receptors.
Proprioception (kinesthetic sense). Loss of position sense indicates damaged muscle/joint receptors.
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Identify the sensory deficit: a patient has vertigo worsened by head rotation; which vestibular structure is implicated?
Identify the sensory deficit: a patient has vertigo worsened by head rotation; which vestibular structure is implicated?
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Semicircular canals. Rotational vertigo suggests dysfunction in rotational motion detectors.
Semicircular canals. Rotational vertigo suggests dysfunction in rotational motion detectors.
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Where is the vestibular apparatus located?
Where is the vestibular apparatus located?
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Inner ear (vestibular labyrinth). The vestibular organs are housed within the temporal bone's inner ear.
Inner ear (vestibular labyrinth). The vestibular organs are housed within the temporal bone's inner ear.
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Which receptors primarily detect muscle stretch to support proprioception?
Which receptors primarily detect muscle stretch to support proprioception?
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Muscle spindles. These stretch receptors in muscle fibers signal muscle length changes.
Muscle spindles. These stretch receptors in muscle fibers signal muscle length changes.
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Which receptors primarily detect tendon tension to support proprioception?
Which receptors primarily detect tendon tension to support proprioception?
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Golgi tendon organs. Monitor muscle tension to prevent injury from excessive force.
Golgi tendon organs. Monitor muscle tension to prevent injury from excessive force.
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Identify the receptor cell type that transduces vestibular mechanical forces into neural signals.
Identify the receptor cell type that transduces vestibular mechanical forces into neural signals.
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Vestibular hair cells. Bend in response to fluid movement, converting motion to signals.
Vestibular hair cells. Bend in response to fluid movement, converting motion to signals.
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What is endolymph and why is it essential for semicircular canal function?
What is endolymph and why is it essential for semicircular canal function?
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Inner-ear fluid whose inertia bends hair cells during rotation. Fluid movement lags during rotation, bending hair cells.
Inner-ear fluid whose inertia bends hair cells during rotation. Fluid movement lags during rotation, bending hair cells.
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What is the vestibulo-ocular reflex (VOR) designed to stabilize during head movement?
What is the vestibulo-ocular reflex (VOR) designed to stabilize during head movement?
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Gaze (retinal image) stability by moving eyes opposite head motion. Automatic eye movements compensate for head motion.
Gaze (retinal image) stability by moving eyes opposite head motion. Automatic eye movements compensate for head motion.
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Which cranial nerve carries vestibular information from the inner ear to the brainstem?
Which cranial nerve carries vestibular information from the inner ear to the brainstem?
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Vestibulocochlear nerve (CN VIII). Vestibular branch transmits balance signals to brain.
Vestibulocochlear nerve (CN VIII). Vestibular branch transmits balance signals to brain.
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Identify the dorsal column–medial lemniscus pathway function most relevant to proprioception.
Identify the dorsal column–medial lemniscus pathway function most relevant to proprioception.
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Carries fine touch, vibration, and conscious proprioception to cortex. This ascending pathway transmits precise touch and position sense.
Carries fine touch, vibration, and conscious proprioception to cortex. This ascending pathway transmits precise touch and position sense.
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What are otoconia (otoliths) and what is their key functional effect?
What are otoconia (otoliths) and what is their key functional effect?
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Calcium carbonate crystals that add mass to detect gravity/acceleration. Their weight allows detection of gravity and acceleration forces.
Calcium carbonate crystals that add mass to detect gravity/acceleration. Their weight allows detection of gravity and acceleration forces.
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What is the specific role of the saccule within the otolith organs?
What is the specific role of the saccule within the otolith organs?
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Detects vertical linear acceleration and head tilt. Oriented vertically to sense up-down motion and gravity.
Detects vertical linear acceleration and head tilt. Oriented vertically to sense up-down motion and gravity.
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Which inner-ear structures detect angular (rotational) acceleration of the head?
Which inner-ear structures detect angular (rotational) acceleration of the head?
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Semicircular canals. Three perpendicular canals detect rotation in all planes.
Semicircular canals. Three perpendicular canals detect rotation in all planes.
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Which inner-ear structures detect linear acceleration and head tilt (gravity)?
Which inner-ear structures detect linear acceleration and head tilt (gravity)?
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Otolith organs (utricle and saccule). Contain calcium crystals that respond to gravity and linear motion.
Otolith organs (utricle and saccule). Contain calcium crystals that respond to gravity and linear motion.
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What is proprioception (kinesthetic sense) in the context of somatosensation?
What is proprioception (kinesthetic sense) in the context of somatosensation?
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Sense of body position and movement from muscles, tendons, and joints. Proprioceptors in muscles/joints detect body position without visual input.
Sense of body position and movement from muscles, tendons, and joints. Proprioceptors in muscles/joints detect body position without visual input.
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Which mechanoreceptor type in joints contributes to proprioceptive information?
Which mechanoreceptor type in joints contributes to proprioceptive information?
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Joint (articular) mechanoreceptors. Detect joint position and movement for spatial awareness.
Joint (articular) mechanoreceptors. Detect joint position and movement for spatial awareness.
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Which option best matches the stimulus: semicircular canals vs otolith organs?
Which option best matches the stimulus: semicircular canals vs otolith organs?
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Semicircular: angular acceleration; otoliths: linear acceleration/tilt. Canals detect rotation; otoliths detect straight-line motion and gravity.
Semicircular: angular acceleration; otoliths: linear acceleration/tilt. Canals detect rotation; otoliths detect straight-line motion and gravity.
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Identify the most likely deficit if a person cannot accurately touch their nose with eyes closed.
Identify the most likely deficit if a person cannot accurately touch their nose with eyes closed.
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Impaired proprioception (kinesthetic sense). Requires position sense from muscle/joint receptors.
Impaired proprioception (kinesthetic sense). Requires position sense from muscle/joint receptors.
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Which vestibular structure is most implicated when spinning causes prolonged sensation of rotation?
Which vestibular structure is most implicated when spinning causes prolonged sensation of rotation?
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Semicircular canals. Fluid continues moving after stopping, creating false rotation sense.
Semicircular canals. Fluid continues moving after stopping, creating false rotation sense.
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Identify the most likely deficit if a patient has vertigo and nystagmus after inner-ear infection.
Identify the most likely deficit if a patient has vertigo and nystagmus after inner-ear infection.
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Vestibular apparatus dysfunction (peripheral vestibular system). Infection damages balance organs, causing spinning sensation and eye movements.
Vestibular apparatus dysfunction (peripheral vestibular system). Infection damages balance organs, causing spinning sensation and eye movements.
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What is the vestibular sense responsible for detecting in everyday behavior?
What is the vestibular sense responsible for detecting in everyday behavior?
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Balance, spatial orientation, and head motion relative to gravity. Inner ear system detects motion and position relative to gravity.
Balance, spatial orientation, and head motion relative to gravity. Inner ear system detects motion and position relative to gravity.
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Which cranial nerve carries vestibular information from the inner ear to the brain?
Which cranial nerve carries vestibular information from the inner ear to the brain?
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Vestibulocochlear nerve (CN VIII). Vestibular branch carries balance info; cochlear carries hearing.
Vestibulocochlear nerve (CN VIII). Vestibular branch carries balance info; cochlear carries hearing.
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What are otoliths, and what is their key role in vestibular transduction?
What are otoliths, and what is their key role in vestibular transduction?
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Calcium carbonate crystals that shift to bend hair cells during tilt/linear motion. Dense crystals amplify gravity/acceleration forces on hair cells.
Calcium carbonate crystals that shift to bend hair cells during tilt/linear motion. Dense crystals amplify gravity/acceleration forces on hair cells.
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What is the role of hair cells in the vestibular system?
What is the role of hair cells in the vestibular system?
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Mechanoreceptors that convert fluid/otolith movement into neural signals. Bend when fluid/otoliths move, triggering action potentials.
Mechanoreceptors that convert fluid/otolith movement into neural signals. Bend when fluid/otoliths move, triggering action potentials.
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Identify the vestibular fluid movement that bends hair cells during head rotation.
Identify the vestibular fluid movement that bends hair cells during head rotation.
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Endolymph inertia deflects the cupula in the semicircular canal ampulla. Fluid lags behind head rotation due to inertia.
Endolymph inertia deflects the cupula in the semicircular canal ampulla. Fluid lags behind head rotation due to inertia.
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What is the vestibulo-ocular reflex (VOR)?
What is the vestibulo-ocular reflex (VOR)?
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Reflex that stabilizes gaze by moving eyes opposite head movement. Compensatory eye movements maintain visual fixation during head turns.
Reflex that stabilizes gaze by moving eyes opposite head movement. Compensatory eye movements maintain visual fixation during head turns.
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Which option best describes why VOR is important for vision during movement?
Which option best describes why VOR is important for vision during movement?
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It keeps images stable on the retina despite head motion. Prevents blurred vision during walking, running, or head movements.
It keeps images stable on the retina despite head motion. Prevents blurred vision during walking, running, or head movements.
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