ACCTG 1 Lecture Notes - Lecture 6: Oval Window, Outer Ear, Inner Ear
Document Summary
Ref: gray, p. & bjorklund, d. f. (2014), psychology (7th ed. ). Sound as a physical stimulus=vibration of air or some other medium produced by an object. Outer ear: receives sound waves and transports them inwards: pinna: the flap of skin and cartilage forming the visible portion of the ear. Auditory canal: opening into the head that ends at the eardrum. Middle ear: air-filled cavity, separated from the outer ear by the eardrum (tympanic membrane): 3 tiny bones collectively called ossicles (hammer, anvil, and stirrup) linked to eardrum at one end and the oval window at the other. When sound causes the eardrum to vibrate, the ossicles vibrate and push against the oval window (separates middle from inner ear). Because the oval window has only about one-thirtieth the area of the tympanic membrane, the pressure funneled to it by the ossicles is about 30 times greater than the pressure on the eardrum.
