stapedius muscle造句

• If the injury is distal to the stapedius muscle, the reflex is still functional.
• Moreover, the full tension of the stapedius muscle cannot be maintained in response to continued stimulation.
• If the mobility of the stapes is reduced due to otosclerosis, then stapedius muscle contraction does not significantly decrease the admittance.
• As the stapedius muscle is innervated by the facial nerve, a measurement of the reflex can be used to locate the injury on the nerve.
• Before the nerve exits the skull via the stylomastoid foramen and after the nerve to the stapedius muscle has branched off, the facial nerve gives off the chorda tympani nerve.
• The stapedius reflex of the middle ear muscles helps protect the inner ear from damage by reducing the transmission of sound energy when the stapedius muscle is activated in response to sound.
• The cavity in the pyramidal eminence is prolonged downward and backward in front of the facial canal, and communicates with it by a minute aperture which transmits a twig from the facial nerve to the Stapedius muscle.
• In the absence of a pathology, a loud sound ( generally greater than 70 dB above threshold ) causes the stapedius muscle to contract, reducing the admittance of the middle ear and softening the perceived loudness of the sound.
• To avoid deafening themselves, whenever a bat makes an echolocation emission, a small muscle in the bat's middle ear ( the stapedius muscle ) clamps down on small bones called ossicles, which normally amplify sounds between the ear drum and the cochlea.
• This is a problem which may be caused by genetic differences, stress or ill-health, or by abnormal responses in the tensor tympani ( tonic tensor tympani syndrome ) and stapedius muscles, which function in the normal acoustic reflex response that protects the inner ear from loud sounds.