Anatomical and Physiological Considerations in Vestibular Dysfunction and Compensation

These flashcards cover key terms and concepts related to vestibular anatomy and physiology, focusing on dysfunction and compensation mechanisms.

Vestibular System

A complex system that integrates sensory information from vestibular, visual, and somatosensory/proprioceptive systems to maintain balance and posture.

Vestibulo-Ocular Reflex (VOR)

A reflex that produces compensatory eye movements in response to head movements, maintaining a stable image on the retina.

Peripheral Vestibular Dysfunction

Dysfunction affecting the end organs in the inner ear and/or the eighth cranial nerve, leading to symptoms such as vertigo and imbalance.

Benign Paroxysmal Positional Vertigo (BPPV)

A common cause of vertigo characterized by episodes triggered by specific head movements, often due to dislodged otoconia.

Compensation

The process by which the vestibular system adapts to deficits, allowing patients to recover functional balance and reduce symptoms.

Stereociliary Bundle

A cluster of hair-like projections on vestibular hair cells that detects head movement and orientation.

Maculae

Structures within the vestibular system that encode gravitational forces and linear acceleration.

Cristae

Sensory structures located in the ampullae of the semicircular canals that detect angular acceleration.

Spontaneous Nystagmus

Involuntary eye movements that occur in some vestibular dysfunctions, typically beating toward the intact ear.

Vestibular Nuclear Complex (VNC)

A group of nuclei in the brainstem that integrate information from the vestibular system and coordinate motor control for eye and head movements.

Neuroepithelia

Tissue in the vestibular system consisting of sensory cells (hair cells) and supporting cells that transduce movement information.

Dynamic Compensation

The recovery of vestibular function that occurs over time, allowing for more normal responses to head movements after a deficit.

Utricle and Saccule

Otolith organs that detect linear accelerations and head position relative to gravity.

Neural Plasticity

The capacity of the vestibular system to adapt and reorganize functionally in response to injury or dysfunction.

Cerebellum

A brain structure that plays a crucial role in coordination and the compensation processes following vestibular deficits.

Ocular Tilt Reaction

A tilting of the head away from the side of the higher neural discharge due to vestibular imbalance.