--part of the external ear that is flexible and supported by elastic cartilage. It protects the external acoustic meatus and provides directional sensitivity to the ear by blocking or facilitating the passage of sound to the eardrum.
Identify A & function
External acoustic meatus
--Passageway in the temporal bone that leads to the tympanic membrane.
Identify B & function
Identify C & function
--A thin, semitransparent connective tissue sheet that separates the external ear from the middle ear.
Identify D & function
--contains auditory ossicles
Identify E & function
--equalizes the pressure in the middle ear cavity with external atmospheric pressure. This is also the route of microorganisms that cause "ear infections"
Identify I & function
--spiral portion of the bony labyrinth of the inner ear that surrounds the organ of hearing.
Identify J & function
Bony labyrinth of inner ear
--a shell of dense bone that surrounds and protects the membranous labyrinth.
Identify L & function
Page 479 (Picture) & 482 (Text)
--part of the inner ear that provides equilibrium sensations by detecting rotation, gravity and acceleration.
Identify M & function
Page 479 (Picture) & 484(Text)
Petrous part of temporal bone
-Tiny ear bones (smallest bones in the body) -Connect the tympanic membrane with the receptor complex of the inner ear
1.) Malleus 2.) Incus 3.) Stapes
What are the three auditory ossicles called?
--almost completely fills the oval window. --auditory ossicles conduct vibrations and movement of the stapes sets up vibrations in the fluid contents of the inner ear.
Semicircular Canals and Ducts
Be able to identify: bony labyrinth, all 3 semicircular ducts, vestibule, cochlea, cochlear duct, endolymph and perilymph