otolith(redirected from ear stone)
Also found in: Dictionary, Encyclopedia, Wikipedia.
Related to ear stone: otolith
1. a granule of the statoconia.
2. a solid or semisolid body occurring in the labyrinth of animals.
otolith/oto·lith/ (o´to-lith) statolith.
One of the small calcareous particles found in the inner ear of many vertebrates, especially fishes, which are involved in determining body orientation and sometimes in perceiving sound.
Etymology: Gk, ous, ear, lithos, stone
1 a calculus in the middle ear.
2 any of the crystals of calcium carbonate attached to the hair cells of the inner ear as gravity orientation receptors.
otolith(1) An auditory ossicle.
(2) A larger calcified concrement within the ear.
(3) A minute calcium carbonate granule located near the sensory hair cell in the inner ear; statolith.
otolithOne of the many tiny calcareous particles found in the utricle and sacculus of the inner ear. These move under gravitational and accelerative forces causing stimulation of hair cells and the production of nerve impulses that provide the brain with information about the position and movement of the head.
otoconiuma granule of calcareous material, several of which occur in the inner ear of vertebrates, where they are attached to processes associated with sensitive cells, and register gravity By means of such sense organs, vertebrates are able to assess their position with respect to gravity.
an earstone; concretions of calcium carbonate and protein in the labyrinth of the inner ear and which move with every change in the posture of the head. Called also statolith.