ANAT 215 Lecture Notes - Lecture 10: Ampulla, Auditory Cortex, Vestibular Duct
18 Aug 2016
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Document Summary
Anatomy 215 (reading material: chapter 18: pages 479-490) External ear (hearing): o o o o. Cartilage and flesh that gives the unique appearance. External auditory/acoustic canal (meatus): ear hole, connects external to inner ear. Lateral 2/3 is made up of cartilage. Medial1/3 is made up of temporal bone. It"s an s shape (doctors pull down on ear lobe to straighten it out) Pharyngotympanic tube (eustachian) : provide connection between middle ear and nasal pharynx. 4cm, made up of elastic cartilage (found in places starting with e . Equalize pressure on either side of the tympanic membrane (ie. ears popping in air plane or deep under water) Children and ear infections, because it"s shorter so it"s easier to get an infection in the middle ear o. Ossicles: bony ossicles, the 3 smallest bones in body. Conduct the vibration through the bones, like a lever system, to illicit an effect on inner ear.
