Biomaterial Database

[A contribution to the "acoustic-mechanical effect" of the ipsilateral registered stapedius-reflex (author's transl)]. 1980

H von Wedel, and H W Pau, and W Tegtmeier

The ipsilateral registered stapedius reflex is often reduced for intensity levels greater than 105 dB (SPL). Because of a reduced impedance, that is not influenced by the reflex arc, an "inverse" reflex curve can be registered. This phenomenon described by Lehnhardt et al. (1) as a "acoustic'mechanical effect" occurs without latency and interferes at levels higher than 105 dB (SPL) with the reflectory impedance change. This effect often dominates and causes a pronounced inverse ipsilateral reaction characterized by an impedance reduction. Frequently middle ears with a steep gradient of the tympanogram show an acoustic-mechanical effect. The missing reflectory component of the impedance change in deafness, in otosclerosis and in facial nerve disorders mostly causes an inverse impedance change. Investigations in temporal bone, in middle-ear models and from the middle ear of the guinea pig led to the assumption, that inverse impedance changes be related to coupling phenomenons of the tympanic-membrane and the ossicles. Excluding artifacts of the measuring device and investigating different states of the middle ear, it can be concluded, that these phenomenons are characteristic for intensity levels greater than 105 dB (SPL).

UI	MeSH Term	Description	Entries
D009132	Muscles	Contractile tissue that produces movement in animals.	Muscle Tissue,Muscle,Muscle Tissues,Tissue, Muscle,Tissues, Muscle
D010040	Otosclerosis	Formation of spongy bone in the labyrinth capsule which can progress toward the STAPES (stapedial fixation) or anteriorly toward the COCHLEA leading to conductive, sensorineural, or mixed HEARING LOSS. Several genes are associated with familial otosclerosis with varied clinical signs.	Otospongiosis,Otoscleroses,Otospongioses
D012022	Reflex, Acoustic	Intra-aural contraction of tensor tympani and stapedius in response to sound.	Acoustic Reflex
D003638	Deafness	A general term for the complete loss of the ability to hear from both ears.	Deafness Permanent,Hearing Loss Permanent,Prelingual Deafness,Deaf Mutism,Deaf-Mutism,Deafness, Acquired,Hearing Loss, Complete,Hearing Loss, Extreme,Acquired Deafness,Complete Hearing Loss,Deafness, Prelingual,Extreme Hearing Loss,Permanent, Deafness,Permanent, Hearing Loss,Permanents, Deafness
D004432	Ear, Middle	The space and structures directly internal to the TYMPANIC MEMBRANE and external to the inner ear (LABYRINTH). Its major components include the AUDITORY OSSICLES and the EUSTACHIAN TUBE that connects the cavity of middle ear (tympanic cavity) to the upper part of the throat.	Tympanic Cavity,Tympanum,Middle Ear,Cavities, Tympanic,Cavity, Tympanic,Ears, Middle,Middle Ears,Tympanic Cavities,Tympanums
D005155	Facial Nerve Diseases	Diseases of the facial nerve or nuclei. Pontine disorders may affect the facial nuclei or nerve fascicle. The nerve may be involved intracranially, along its course through the petrous portion of the temporal bone, or along its extracranial course. Clinical manifestations include facial muscle weakness, loss of taste from the anterior tongue, hyperacusis, and decreased lacrimation.	Acquired Facial Neuropathy,Cranial Nerve VII Diseases,Facial Myokymia,Facial Neuropathy,Geniculate Ganglionitis,Cranial Nerve VII Disorders,Facial Nerve Disorders,Facial Nerve Motor Disorders,Facial Nerve Sensory Disorders,Facial Neuritis,Familial Facial Neuropathy,Motor Disorders, Facial Nerve,Sensory Disorders, Facial Nerve,Seventh Cranial Nerve Diseases,Acquired Facial Neuropathies,Disease, Facial Nerve,Diseases, Facial Nerve,Disorder, Facial Nerve,Disorders, Facial Nerve,Facial Myokymias,Facial Nerve Disease,Facial Nerve Disorder,Facial Neuritides,Facial Neuropathies,Facial Neuropathies, Acquired,Facial Neuropathies, Familial,Facial Neuropathy, Acquired,Facial Neuropathy, Familial,Familial Facial Neuropathies,Ganglionitides, Geniculate,Ganglionitis, Geniculate,Geniculate Ganglionitides,Myokymia, Facial,Myokymias, Facial,Neuritides, Facial,Neuritis, Facial,Neuropathies, Facial,Neuropathies, Familial Facial,Neuropathy, Facial,Neuropathy, Familial Facial
D006168	Guinea Pigs	A common name used for the genus Cavia. The most common species is Cavia porcellus which is the domesticated guinea pig used for pets and biomedical research.	Cavia,Cavia porcellus,Guinea Pig,Pig, Guinea,Pigs, Guinea
D006801	Humans	Members of the species Homo sapiens.	Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D000158	Acoustic Impedance Tests	Objective tests of middle ear function based on the difficulty (impedance) or ease (admittance) of sound flow through the middle ear. These include static impedance and dynamic impedance (i.e., tympanometry and impedance tests in conjunction with intra-aural muscle reflex elicitation). This term is used also for various components of impedance and admittance (e.g., compliance, conductance, reactance, resistance, susceptance).	Audiometry, Impedance,Electroacoustic Impedance Tests,Impedance Tests, Acoustic,Tympanometry,Acoustic Impedance Test,Electroacoustic Impedance Test,Impedance Audiometry,Impedance Test, Acoustic,Impedance Test, Electroacoustic,Impedance Tests, Electroacoustic,Test, Acoustic Impedance,Test, Electroacoustic Impedance,Tests, Acoustic Impedance,Tests, Electroacoustic Impedance
D000818	Animals	Unicellular or multicellular, heterotrophic organisms, that have sensation and the power of voluntary movement. Under the older five kingdom paradigm, Animalia was one of the kingdoms. Under the modern three domain model, Animalia represents one of the many groups in the domain EUKARYOTA.	Animal,Metazoa,Animalia