stapedius造句

• Two small muscles, the tensor tympani and stapedius, also help modulate noise.
• 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.
• When presented with a high-intensity sound stimulus, the stapedius and tensor tympani muscles of the ossicles contract.
• Like the stapedius, all of these muscles derive from the hyoid arch and are innervated by cranial nerve VII.
• If the mobility of the stapes is reduced due to otosclerosis, then stapedius muscle contraction does not significantly decrease the admittance.
• Also located in the middle ear are the stapedius and tensor tympani muscles which protect the hearing mechanism through a stiffening reflex.
• Axons of type SVE, special visceral efferent, innervate muscles of facial expression, stapedius, the posterior belly of digastric, and the stylohyoid.
• 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.
• The stylohyoid muscle, stapedius and posterior belly of the digastric muscle are also innervated by the facial nerve, but are not considered muscles of facial expression.
• 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.
• A certain degree of top-down control is present at the middle ear level primarily through two muscles present in this anatomical region : the tensor tympani and the stapedius.
• 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 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 mammalian stapedius evolved from a muscle called the depressor mandibulae in other tetrapods, the function of which was to open the jaws ( this function was taken over by the digastric muscle in mammals ).
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• However, the extent of the movements of the ossicles is controlled ( and constricted ) by two muscles attached to them ( the " tensor tympani " and the " stapedius " ).
• 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.