It is probably caused when pieces that have broken off otoliths have slipped into one of the semicircular canals.
32.
In rare cases, the crystals themselves can adhere to a semicircular canal cupula, rendering it heavier than the surrounding endolymph.
33.
The semicircular system of MCCM-HUE-8741 shows also a basal morphology, because the semicircular canals do not attach to each other.
34.
The utricle and saccule are sensors for detecting angular or linear acceleration, and the three semicircular canals detect head rotation.
35.
Lampreys have only two semicircular canals, with the horizontal canal being absent, while hagfish have only a single, vertical, canal.
36.
Unlike jawed vertebrates, which have three semicircular canals in each inner ear, lampreys have only two and hagfishes just one.
37.
BPPV is the most common cause of vertigo, a problem attributed to a detached otoconia in one of the semicircular canals.
38.
The semicircular canals, found within the vestibular apparatus, let us know when we are in a rotary ( circular ) motion.
39.
Purely horizontal nystagmus and symptoms of vertigo lasting more than one minute can also indicate BPPV occurring in the horizontal semicircular canal.
40.
The three semicircular canals are mutually orthogonal ( similar to three-axis accelerometer ) and are filled with a fluid called the endolymph.
