(1) Microionophoretically applied excitatory amino acids induced firing of extracellularly recorded single units in a tissue slice preparation of the mouse cochlear nucleus, and the similarly applied antagonist 2-amino-5-phosphonovalerate (2APV) was demonstrated to be a selective N-methyl-D-aspartate (NMDA) receptor antagonist.
(2) Furthermore the limit between hearing aid fitting an cochlear implantation is discussed.
(3) The lengths and heights of the scalae tympani in ten pairs of serially sectioned temporal bones were measured by an adaptation of the serial section method of cochlear reconstruction.
(4) Neither light nor electron microscopy revealed significant morphologic alterations in the cochlear elements of the exposed offspring.
(5) The next implanted device will have: a. constant current; b. programming of a particular current value for each electrode; and c. stimulation of the cochlear nerve through an extra cochlear electrode bearer, allowing deep implantation without deafness.
(6) There is evidence to indicate that these losses are due to congenital ossicular anomalies, eustachian tube dysfunction from craniofacial malformation, and cochlear involvement that is greatest for high frequencies.
(7) At the House Ear Institute, speech and language assessments are a regular part of the evaluation protocol for the cochlear implant clinical trials in children.
(8) Patterns of degeneration of cochlear hair cells were compared with the functional audiometric examinations.
(9) These results are consistent with changes in cochlear metabolism which have been reported previously using similar techniques, suggesting that increases in blood flow may be linked to increases in local metabolism.
(10) Measurements of volume and length were made on isolated guinea pig cochlear outer hair cells (OHCs) in an attempt to establish whether OHC shortening was accompanied by changes in cell volume.
(11) We have mapped cochlear nerve terminations in the cochlear nucleus with DiI and, using three-dimensional reconstructions, have demonstrated the topography and geometry of the cochlear input.
(12) A mathematical model of cochlear processing is developed to account for the nonlinear dependence of frequency selectivity on intensity in inner hair cell and auditory nerve fiber responses.
(13) Primary cochlear afferents are found only in the ventral zone of the dorsal cochlear nucleus.
(14) Phaseolus vulgaris leucoagglutinin (PHA-L), a kidney bean lectin used as an anterograde tracer, was iontophoretically injected into the posteroventral cochlear nucleus (PVCN) of guinea pigs.
(15) Other differences in cytoarchitecture, within the great apes and humans, include decreases in the small and giant cell populations of the cochlear complex.
(16) The shapes of interval histograms agreed with those found in cat cochlear nerve fibres.
(17) The operative manipulations representing stretch or compression injury to the cochlear nerve in the CPA leads to an acute traumatic cranial nerve root lesion--a retrocochlear lesion.
(18) The effects of auditory fatigue, using a temporary threshold shift (TTS) paradigm, on cochlear microphonics (CM) and on auditory brainstem-evoked potentials (ABEP), were studied in normal-hearing subjects during the development of permanent threshold shift (PTS).
(19) The magnitude of these changes correlated well with the intrinsic ototoxicity of the drugs previously established in cochlear perfusions: neomycin greater than gentamicin approximately equal to tobramycin greater than amikacin approximately equal to kanamycin approximately equal to netilmicin greater than neamine approximately equal to spectinomycin.
(20) So far we believe that loss of hearing caused during these operations is mainly due to the unfavorable location of the cochlear blood supply through the meatus.
Lagena
Definition:
(n.) The terminal part of the cochlea in birds and most reptiles; an appendage of the sacculus, corresponding to the cochlea, in fishes and amphibians.
Example Sentences:
(1) The recess is an evagination of the lagena, and is invested externally by dense periotic connective tissue, except over a thin area of one wall abutting against a periotic diverticulum communicating with the periotic sac.
(2) Hair cell polarization patterns were investigated on the sensory macule of the sacculus and lagena of the lake whitefish.
(3) The results provide evidence that the neurones with periodic spontaneous discharge innervate the lagena and that this sense organ has no auditory significance in birds.
(4) The response dynamics of afferents in the utricle and lagena correspond with the macular locations of their peripheral arborizations.
(5) In Ancistrus afferents of sacculus and lagena terminate in an area which is distinct based on its cytoarchitecture.
(6) The otic relationships of the recess and papilla to the proximal part of the lagena and saccule are described, and new terminology is suggested for the periotic relationships of the basilar recess to a diverticulum of an intracapsular periotic sac.
(7) However, a far greater number of type A hair cells were found in high frequency sensitive sensory organs (sacculus, amphibian and basilar papillae) than low frequency sensitive vestibular sensory structures (canal cristae, utriculus and lagena).
(8) Experiments using organotypic cultures of the embryonic lagena macula indicate that the antibodies cause a significant increase in the steady-state stiffness of the stereocilia bundle but do not inhibit mechanotransduction.
(9) Injection of HRP or tritiated proline into the basilar papilla produced patterns of labeling similar to that seen in the 2-day degeneration material; HRP reaction product or autoradiographic label were seen only in the ipsilateral NA and NM and in the ipsilateral projection areas of the macula lagena but not in either NL.
(10) The recess forms a tubular diverticulum of the proximal part of the lagena.
(11) Afferents of the sacculus and the lagena terminate predominantly in the saccular nucleus.
(12) acoustic fibres which come from the sacculus and lagena, have projections separate from those of the utriculus and canal organs.
(13) The anatomy and ultrastructure of the sacculus, lagena, and utriculus of the ear of Polypterus bichir and Scaphirhynchus platorynchus were studied using the scanning electron microscope.
(14) The peripheral origin of the 'non-auditory' neurones with irregular spontaneous activity remains undecided and might be the macula lagenae or the apical portion of the basilar papilla.
(15) The lagena is like the utricle in having hair cells with the kinocilium on the side of the cell toward the opposition line, but in the saccule the kinocilia face away from the line, and the small macula neglecta consists of two completely separate, oppositely oriented patches.
(16) Fractions of all three groups of cochlear ganglion neurones were responsive to direct deformations of the membraneous lagena.
(17) Fluid motion produced by opercular motion could stimulate various end organs of the inner ear; the saccule, lagena, and amphibian papilla are in close approximation and wave energy could directly affect their otoconial or tectorial structures.
(18) We studied the effects of GABA, muscimol, bicuculline and picrotoxin on the spontaneous spike discharge of the afferent fibers of the sacculi lagena and anterior semicircular canal.
(19) No evidence was found of auditory input to the region which receives projections from the macula lagena.
(20) Double label studies indicate that the entire stereocilia bundle is stained in the lagena macula (a vestibular organ), whereas in the basilar papilla (an auditory organ) only the proximal region of the stereocilia bundle nearest to the apical surface is stained.