Semicircular canals


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Related to Semicircular canals: utricle
(Anat.) certain canals of the inner ear. See under Ear.

See also: Semicircular

References in periodicals archive ?
The semicircular canals and their neural elements are derived from the two prominences of the otocyst, the horizontal and vertical canal pouches.
Canalithiasis is the most commonly accepted mechanism, wherein the otoliths that detach from the utricle or saccule and floating freely in the endolymph system of the semicircular canals cause neuronal stimulation.
It is accepted that dislodged otoconia detaching from the utricle macula slide into the semicircular canals and initiate vertiginous symptoms.
Erosion of the cochlea, vestibule or semicircular canals is regarded as labyrinthine fistula and often occurs because of cholesteatoma (1, 2).
The three dimensional processing of VOR is allowed by the simultaneous function of the semicircular canals, otolith organs as well as the oculomotor system that is coordinated by the central nervous system.
In the inner ear of vertebrates, the balance system consists of three semicircular canals that contain fluid and sensory hair cells that detect movement of the head.
In an animal experiment, Angelaki et al reported that after they had plugged the horizontal semicircular canals of rhesus monkeys, recovery of VOR gain and phase in response to yaw rotation was frequency-dependent; recovery was greatest at the highest frequency tested and it progressively diminished at the lower frequencies.
However, there are many systems, apart from the semicircular canals, controlling eye movements [1].
Although the pathophysiological process of the disease has not been fully clarified, currently, the widely accepted opinion is that the disease results from the accumulation of otoconia that are detached from the utricular macula in the semicircular canals and thereby sensitizing such canals to gravity (1).
"Head position definitely can have an effect on air sickness because it has to do with the orientation of the semicircular canals in the inner ear," he told me.
The caloric test is the most widely used test to assess the function of the semicircular canals. Although the stimulation applied in the caloric test is not physiological, it enables the evaluation of both labyrinths separately (1).