Spina vestibuli

Spina vestibuli is a medical term referring to a bony ridge located in the inner ear's vestibule. This structure is part of the bony labyrinth, which is a complex system of passages in the temporal bone of the skull. The spina vestibuli is an important anatomical feature involved in the process of hearing and balance.

Anatomy

The spina vestibuli is located in the vestibule of the inner ear, which is the central part of the bony labyrinth. The vestibule is situated medial to the tympanic cavity, posterior to the cochlea, and anterior to the semicircular canals. The spina vestibuli is a bony ridge that separates the utricle from the saccule.

Function

The spina vestibuli, along with the other structures of the vestibule, plays a crucial role in the body's sense of balance. The utricle and saccule, which are separated by the spina vestibuli, contain sensory cells that detect movement and changes in position. When the head moves, fluid within these structures shifts, stimulating the sensory cells. These cells then send signals to the brain, which interprets this information and helps maintain balance.

Clinical significance

Abnormalities or damage to the spina vestibuli and other structures of the vestibule can lead to balance disorders such as vertigo, Meniere's disease, and benign paroxysmal positional vertigo (BPPV). These conditions can cause symptoms such as dizziness, loss of balance, and problems with spatial orientation.

The interior of the right osseous labyrinth. (Spina vestibuli not labeled, but region is visible.)

See also

• Inner ear
• Vestibule (ear)
• Bony labyrinth
• Balance disorder