utrikül

The utricle is one of the two otolith organs in the vestibular labyrinth of the inner ear. Located within the bony labyrinth, it is a small, sac-like membranous structure situated in the vestibule, posterior to the oval window. The utricle, along with its counterpart, the saccule, is responsible for detecting linear acceleration and the pull of gravity.

The sensory epithelium of the utricle is called the macula utriculi. This macula is covered by a gelatinous layer called the otolithic membrane, which contains tiny calcium carbonate crystals known as otoliths. Embedded within this membrane are hair cells, the sensory receptors of the vestibular system. When the head moves or changes its orientation relative to gravity, the otoliths shift, causing the gelatinous membrane to move and stimulate the hair cells.

The hair cells, in turn, send signals via the vestibular nerve to the brainstem and cerebellum. These signals are interpreted as information about the body's position in space, linear motion, and head tilt. The utricle is particularly sensitive to horizontal movements and tilts of the head. Its information is crucial for maintaining balance, posture, and coordinating eye movements with head movements (the vestibulo-ocular reflex). Damage or dysfunction of the utricle can lead to symptoms such as vertigo, dizziness, and unsteadiness.