PSYCH 101 Lecture Notes - Lecture 8: Olfactory Mucosa, Congenital Insensitivity To Pain, Basilar Membrane
10 Dec 2017
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Document Summary
Sound waves are pressure changes in the atmosphere capable of being detected by auditory organs. Sound waves cause the tympanic membrane to vibrate, thus moving the ossicles (three bones in the ear) to vibrate the oval window which transfers the vibrations to fluid in the cochlea. Different parts of the basilar membrane inside the cochlea vibrate in response to different frequencies. Hair cells are present along the entire length of the basilar membrane. When the region of the basilar membrane to which a hair cell is attached vibrates, the hair cell releases neurotransmitter that causes an action potential in the auditory nerve. Infants can hear distinction in speech sounds that an adult cannot. Knowledge of a language influences how speech sounds are heard. The vestibular organs can all be found in the inner and are used to tell the brain about the orientation and movement of the body.
