dict.md logo
Choose languages of interest
Add further languages:
Add all languages
Cochlea definition: The part of the inner ear (LABYRINTH) that is concerned with hearing. It forms the anterior part of the labyrinth, as a snail-like structure that is situated almost horizontally anterior to the VESTIBULAR LABYRINTH.
cochlea definition: part of the internal ear that is concerned with hearing; forms the anterior part of the labyrinth, is conical, and is placed almost horizontally anterior to the vestibule.
Cochlea definition: The snail shell-shaped auditory component of the inner ear. It contains the sensory organ of hearing.
Cochlear Aqueduct definition: A fine channel that passes through the TEMPORAL BONE near the SCALA TYMPANI (the basilar turn of the cochlea). The cochlear aqueduct connects the PERILYMPH-filled bony labyrinth to the SUBARACHNOID SPACE.
Cochlear Diseases definition: Pathological processes of the snail-like structure (COCHLEA) of the inner ear (LABYRINTH) which can involve its nervous tissue, blood vessels, or fluid (ENDOLYMPH).
Cochlear Implants definition: Electronic hearing devices typically used for patients with normal outer and middle ear function, but defective inner ear function. In the COCHLEA, the hair cells (HAIR CELLS, VESTIBULAR) may be absent or damaged but there are residual nerve fibers. The device electrically stimulates the COCHLEAR NERVE to create sound sensation.
Stimulators, Electrical, Auditory, Cochlear definition: Electrical stimulators that apply stimuli to the cochlea. These stimulators consist of an electrode array that is surgically inserted in one cochlea, a receiver that is implanted in the skull near the ear and connected to the electrode array, and a speech transducer that is worn externally. The speech transducer converts sound into electrical signals that are transmitted to the receiver, which in turn stimulate the cochlea through the electrode array. These stimulators are used for the partial restoration of auditory sensation to profoundly deaf patients.
cochlear implant definition: electronic hearing devices typically used for patients with normal outer and middle ear function, but defective inner ear function; in the cochlea, the hair cells may be absent or damaged but there are residual nerve fibers, the device electrically stimulates the cochlear nerve to create sound sensation.
Cochlear Microphonic Potentials definition: The electric response of the cochlear hair cells to acoustic stimulation.
cochlear microphonic potential definition: electrical potentials generated in the hair cells of the organ of Corti in response to acoustic stimulation.
Cochlear Nerve definition: The cochlear part of the 8th cranial nerve (VESTIBULOCOCHLEAR NERVE). The cochlear nerve fibers originate from neurons of the SPIRAL GANGLION and project peripherally to cochlear hair cells and centrally to the cochlear nuclei (COCHLEAR NUCLEUS) of the BRAIN STEM. They mediate the sense of hearing.
cochlear nerve definition: cochlear part of the 8th cranial nerve (vestibulocochlear nerve); cochlear nerve fibers originate from neurons of the spiral ganglion and project peripherally to cochlear hair cells and centrally to the cochlear nuclei of the brain stem; mediates the sense of hearing.
ear hair cell definition: cells found in the epithelial lining of the labyrinth of the inner ear; the hairs are stereovilli that restrict the plane in which deformation of the apical membrane of the cell can be brought about by movement of fluid or by sound; movement of the single stereocilium transduces mechanical movements into electrical receptor potentials.
Hair Cells, Auditory definition: Sensory cells in the organ of Corti, characterized by their apical stereocilia (hair-like projections). The inner and outer hair cells, as defined by their proximity to the core of spongy bone (the modiolus), change morphologically along the cochlea. Towards the cochlear apex, the length of hair cell bodies and their apical stereocilia increase, allowing differential responses to various frequencies of sound.
Hair Cell definition: Mechanoreceptors located in the organ of Corti that are sensitive to auditory stimuli and in the vestibular apparatus that are sensitive to movement of the head. In each case the accessory sensory structures are arranged so that appropriate stimuli cause movement of the hair-like projections (stereocilia and kinocilia) which relay the information centrally in the nervous system. (MeSH)
Hair Cells, Auditory, Inner definition: Auditory sensory cells of organ of Corti, usually placed in one row medially to the core of spongy bone (the modiolus). Inner hair cells are in fewer numbers than the OUTER AUDITORY HAIR CELLS, and their stereocilia are approximately twice as thick as those of the outer hair cells.
Inner Hair Cell of the Organ of the Corti definition: A cell situated on the inner most layer of the basilar membrane of the cochlea. Each cell has multiple, sensitive strands called stereocilia. In the resting state the stereocilia are leaning on each other in a conical bundle and touch the tectorial membrane. When the cochlea moves in response to sound, a slight shearing force occurs between the basilar and tectorial membranes, the stereocilia bend and send electrical impulses to the brain via the eighth cranial nerve.
Type I Hair Cell definition: Bulbous cells that are medially placed in one row in the organ of Corti. In contrast to the outer hair cells, the inner hair cells are fewer in number, have fewer sensory hairs, and are less differentiated. (MeSH)
Round Window, Ear definition: Fenestra of the cochlea, an opening in the basal wall between the MIDDLE EAR and the INNER EAR, leading to the cochlea. It is closed by a secondary tympanic membrane.
Spiral Ganglion definition: The sensory ganglion of the COCHLEAR NERVE. The cells of the spiral ganglion send fibers peripherally to the cochlear hair cells and centrally to the COCHLEAR NUCLEI of the BRAIN STEM.
Cochlear Nucleus definition: The brain stem nucleus that receives the central input from the cochlear nerve. The cochlear nucleus is located lateral and dorsolateral to the inferior cerebellar peduncles and is functionally divided into dorsal and ventral parts. It is tonotopically organized, performs the first stage of central auditory processing, and projects (directly or indirectly) to higher auditory areas including the superior olivary nuclei, the medial geniculi, the inferior colliculi, and the auditory cortex.
Cochlear Nucleus definition: Located at the brainstem, this sensory organ receives auditory signals from the cochlear auditory nerve fibers. It is composed of the dorsal cochlear nucleus located on the dorsolateral surface of the inferior peduncle and the ventral (or accessory) cochlear nucleus located on the ventral aspect of the inferior peduncle.
Endolymphatic Hydrops definition: An accumulation of ENDOLYMPH in the inner ear (LABYRINTH) leading to buildup of pressure and distortion of intralabyrinthine structures, such as COCHLEA and SEMICIRCULAR CANALS. It is characterized by SENSORINEURAL HEARING LOSS; TINNITUS; and sometimes VERTIGO.
Cochlear Implantation definition: Surgical insertion of an electronic hearing device (COCHLEAR IMPLANTS) with electrodes to the COCHLEAR NERVE in the inner ear to create sound sensation in patients with residual nerve fibers.
cochlear lesion definition: pathological or traumatic discontinuity of the cochlea or loss of function of the cochlea.
Cochlear Duct definition: A spiral tube that is firmly suspended in the bony shell-shaped part of the cochlea. This ENDOLYMPH-filled cochlear duct begins at the vestibule and makes 2.5 turns around a core of spongy bone (the modiolus) thus dividing the PERILYMPH-filled spiral canal into two channels, the SCALA VESTIBULI and the SCALA TYMPANI.
cochléaire definition: Plante herbacée vivace ou bisannuelle de la famille des Brassicacées.