ANAT 102 Lecture Notes - Lecture 17: Dynamic Equilibrium, Endolymph, Hair Cell

• School: Drexel University
• Department: Anatomy
• Course: ANAT 102
• Professor: Michael Kirifides

Document Summary

Can transduce sound 1000x faster than photoreceptors can respond to light. 3 regions of the ear: external ear, auricle: Captures sound waves and channels them in: external auditory canal: Lies in the temporal bone and leads to the eardrum. Contains ceruminous glands that secrete earwax (1) earwax prevents foreign object from coming in (2) prevents damage to delicate skin by water or bugs: tympanic membrane /eardrum: Tearing is called perforated eardrum: waves cause the eardrum to vibrate which then causes the malleus to vibrate, middle ear, conveys sound vibrations from eardum, through the ossicles and to the oval window, auditory ossicles: Transmit and amplify vibrations from the eardrum to the oval window: malleus: (1) attaches to the eardrum. Stapes (base) (1) fits into the oval window: tensor tympani: Limits the movements and increase tension on the eardrum to prevent damage to inner ear from loud noise: stapedius, dampens the large vibrations of the stapes due to loud noise.