Semicircular canals

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Semicircular canals
Exterior of labyrinth.
Latin	canalis semicircularis
Gray's	subject #232 1049
System
MeSH	A09.246.631.663
Inner ear illustration showing semicircular canal, hair cells, ampulla, cupula, vestibular nerve, & fluid

The semicircular canals are three half-circular, interconnected tubes located inside each ear that are the equivalent of three gyroscopes located in three planes perpendicular. The vertical canals are positioned at an angle of about 100 degrees relative to one another, while the horizontal canal makes an angle of about 95 degrees with the posterior canal and an angle of about 110 degrees with the anterior canal. Deviations up to 10-15 degrees between individuals are normal. Because the angles between the canals are not perpendicular, movements of the head stimulate horizontal and vertical canals simultaneously.

The three canals are:

• Superior semicircular canal
• Posterior semicircular canal
• Horizontal semicircular canal

Each canal is filled with a fluid called endolymph and contains a motion sensor with little hairs (cilia) whose ends are embedded in a gelatinous structure called the cupula.

The Semicircular canals are a component of the Labyrinth.

External links

nl:Half-cirkelvormige kanalen