CSD-2260 Lecture 5: CSD 2260 Chapter 9 Auditory Anatomy
1 Dec 2016
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Document Summary
The ear changes acoustic energy into electrochemical energy. Collector of sound that is processed in the middle ear and cochlea. 2/3 of ear canal housed in bone. 1/3 of ear canal composed of cartilaginous parts. Responsible for initiating mechanical impedance-matching process of middle ear. Contains the three smallest bones of the body. Bones of middle ear are called ossicles. Largest of the ossicles (9 mm long, weighs 25mg) Provides point of attachment with tympanic membrane. Bulk of bone is head or caput. Incus and malleus articulate by means of a saddle joint. Weighs 4mg with an area of 3. 5mm. Helps transmit sound vibrations from eardrum to oval window. Articulation of incus and stapes of ball and socket type. Muscles of middle ear attached to ossicles. Landmarks of medial wall of meddle ear cavity. Embedded within petrous portion of temporal bone. Fluid found within superficial cavities of the labyrinth. Contains sense organs for movement of the body in space.
