MCAT Psychological Social Foundations Flashcards: 6a Kinesthetic Vestibular Senses

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This deck focuses on 6a Kinesthetic Vestibular Senses, giving you a quick way to review the definitions, rules, and examples that matter most for MCAT Psychological Social Foundations.

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Work through these flashcards in short sessions. Try to answer each prompt before flipping the card, then revisit any cards you miss until the explanation feels automatic.

Flashcard 1: What is the name of the gelatinous structure that hair cell stereocilia embed in within semicircular canals?

Answer: Cupula. Endolymph movement deflects this structure during rotation.

Flashcard 2: What is the role of otoconia (otoliths) in the utricle and saccule?

Answer: Add inertia to deflect hair cells during linear acceleration/tilt. Calcium carbonate crystals provide mass for detecting acceleration.

Flashcard 3: Identify the correct match: semicircular canals detect  ; otolith organs detect  .

Answer: Angular acceleration; linear acceleration and head tilt (gravity). Canals sense rotation; otoliths sense straight-line motion and gravity.

Flashcard 4: Identify the sensory deficit: a patient cannot tell finger position with eyes closed; which sense is impaired?

Answer: Proprioception (kinesthetic sense). Loss of position sense indicates damaged muscle/joint receptors.

Flashcard 5: Identify the sensory deficit: a patient has vertigo worsened by head rotation; which vestibular structure is implicated?

Answer: Semicircular canals. Rotational vertigo suggests dysfunction in rotational motion detectors.

Flashcard 6: Where is the vestibular apparatus located?

Answer: Inner ear (vestibular labyrinth). The vestibular organs are housed within the temporal bone's inner ear.

Flashcard 7: Which receptors primarily detect muscle stretch to support proprioception?

Answer: Muscle spindles. These stretch receptors in muscle fibers signal muscle length changes.

Flashcard 8: Which receptors primarily detect tendon tension to support proprioception?

Answer: Golgi tendon organs. Monitor muscle tension to prevent injury from excessive force.

Flashcard 9: Identify the receptor cell type that transduces vestibular mechanical forces into neural signals.

Answer: Vestibular hair cells. Bend in response to fluid movement, converting motion to signals.

Flashcard 10: What is endolymph and why is it essential for semicircular canal function?

Answer: Inner-ear fluid whose inertia bends hair cells during rotation. Fluid movement lags during rotation, bending hair cells.

Flashcard 11: What is the vestibulo-ocular reflex (VOR) designed to stabilize during head movement?

Answer: Gaze (retinal image) stability by moving eyes opposite head motion. Automatic eye movements compensate for head motion.

Flashcard 12: Which cranial nerve carries vestibular information from the inner ear to the brainstem?

Answer: Vestibulocochlear nerve (CN VIII). Vestibular branch transmits balance signals to brain.

Flashcard 13: Identify the dorsal column–medial lemniscus pathway function most relevant to proprioception.

Answer: Carries fine touch, vibration, and conscious proprioception to cortex. This ascending pathway transmits precise touch and position sense.

Flashcard 14: What are otoconia (otoliths) and what is their key functional effect?

Answer: Calcium carbonate crystals that add mass to detect gravity/acceleration. Their weight allows detection of gravity and acceleration forces.

Flashcard 15: What is the specific role of the saccule within the otolith organs?

Answer: Detects vertical linear acceleration and head tilt. Oriented vertically to sense up-down motion and gravity.

Flashcard 16: Which inner-ear structures detect angular (rotational) acceleration of the head?

Answer: Semicircular canals. Three perpendicular canals detect rotation in all planes.

Flashcard 17: Which inner-ear structures detect linear acceleration and head tilt (gravity)?

Answer: Otolith organs (utricle and saccule). Contain calcium crystals that respond to gravity and linear motion.

Flashcard 18: What is proprioception (kinesthetic sense) in the context of somatosensation?

Answer: Sense of body position and movement from muscles, tendons, and joints. Proprioceptors in muscles/joints detect body position without visual input.

Flashcard 19: Which mechanoreceptor type in joints contributes to proprioceptive information?

Answer: Joint (articular) mechanoreceptors. Detect joint position and movement for spatial awareness.

Flashcard 20: Which option best matches the stimulus: semicircular canals vs otolith organs?

Answer: Semicircular: angular acceleration; otoliths: linear acceleration/tilt. Canals detect rotation; otoliths detect straight-line motion and gravity.

Flashcard 21: Identify the most likely deficit if a person cannot accurately touch their nose with eyes closed.

Answer: Impaired proprioception (kinesthetic sense). Requires position sense from muscle/joint receptors.

Flashcard 22: Which vestibular structure is most implicated when spinning causes prolonged sensation of rotation?

Answer: Semicircular canals. Fluid continues moving after stopping, creating false rotation sense.

Flashcard 23: Identify the most likely deficit if a patient has vertigo and nystagmus after inner-ear infection.

Answer: Vestibular apparatus dysfunction (peripheral vestibular system). Infection damages balance organs, causing spinning sensation and eye movements.

Flashcard 24: What is the vestibular sense responsible for detecting in everyday behavior?

Answer: Balance, spatial orientation, and head motion relative to gravity. Inner ear system detects motion and position relative to gravity.

Flashcard 25: Which cranial nerve carries vestibular information from the inner ear to the brain?

Answer: Vestibulocochlear nerve (CN VIII). Vestibular branch carries balance info; cochlear carries hearing.

Flashcard 26: What are otoliths, and what is their key role in vestibular transduction?

Answer: Calcium carbonate crystals that shift to bend hair cells during tilt/linear motion. Dense crystals amplify gravity/acceleration forces on hair cells.

Flashcard 27: What is the role of hair cells in the vestibular system?

Answer: Mechanoreceptors that convert fluid/otolith movement into neural signals. Bend when fluid/otoliths move, triggering action potentials.

Flashcard 28: Identify the vestibular fluid movement that bends hair cells during head rotation.

Answer: Endolymph inertia deflects the cupula in the semicircular canal ampulla. Fluid lags behind head rotation due to inertia.

Flashcard 29: What is the vestibulo-ocular reflex (VOR)?

Answer: Reflex that stabilizes gaze by moving eyes opposite head movement. Compensatory eye movements maintain visual fixation during head turns.

Flashcard 30: Which option best describes why VOR is important for vision during movement?

Answer: It keeps images stable on the retina despite head motion. Prevents blurred vision during walking, running, or head movements.