Clinical, experimental, and theoretical investigations of the effect of superior semicircular canal
dehiscence on hearing mechanisms.
BPPV is often accompained with nausea, vomiting, (27) and is usually caused by dislodged otoconia in the posterior semicircular canal
There's more than one technique to move the particles in your semicircular canals
back into a position where they will no longer cause vertigo.
By comparing the semicircular canals
of extinct species to those of existing species, the researchers could determine if the extinct animals moved with agility, leaping like monkeys or lemurs or swinging from limb to limb like gibbons, or travelled more slowly like baboons or gorillas.
Movement of fluid in the semicircular canals
signals the brain about the direction and speed of rotation of the head--for example, whether we are nodding our head up and down or looking from right to left.
Although vestibular eye movements adequately compensate for most natural head movements, which are brief, the signal from the semicircular canals
copes less well with sustained head rotations, such as those which occur if we move in a circle for several seconds.
Thomas Lempert of the National Hospital for Neurology in London, speculated that these particles would move out of the semicircular canal
, thereby curing vertigo.
Superior semicircular canal
dehiscence and an abnormally wide internal auditory meatus are clinical entities characterized by vestibular and cochlear symptoms.
A drug is considered ototoxic if it has the potential to cause toxic reactions to structures of the inner ear, including the cochlea, vestibule, semicircular canals
and otoliths, thus causing sensorineural hearing loss.
Fluid in the ear's semicircular canals
moves with the body's motion and this stimulates receptors in various parts of the brain.
Size and layout of the inner ear-particularly of the semicircular canals
, which aid balance-differ greatly in Neandertals and Homo sapiens, assert Fred Spoor of University College London and his coworkers.
High-resolution computed tomography of the temporal bones revealed a hypoplastic bony island between the vestibule and horizontal semicircular canals
, as well as incomplete bones coverage of the posterior semicircular canal
Although humans and apes share many aspects of inner-ear anatomy, humans display markedly larger semicircular canals
relative to body weight, Spoor holds.
The cochlea, semicircular canals
, and internal auditory canal were normal.
Chemical labyrinthectomy refers to the elimination of the vestibular end organs, especially the utricle and semicircular canals
, via transcanal instillation of an ototoxic drug such as streptomycin or gentamicin.