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Eye & Ear

General & Special Senses
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Anatomy of the Ear
Auricle

--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

Page 479
External acoustic meatus

--Passageway in the temporal bone that leads to the tympanic membrane.
Identify B & function

Page 479
Elastic Cartilage
Identify C & function

Page 479
Tympanic Membrane

--A thin, semitransparent connective tissue sheet that separates the external ear from the middle ear.
Identify D & function

Page 479
Tympanic Cavity

--contains auditory ossicles
Identify E & function

Page 479
Oval window
Identify F

Page 479
Round window
Identify G

Page 479
Vestibule
Identify H

Page 479
Auditory tube

--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

Page 479
Cochlea

--spiral portion of the bony labyrinth of the inner ear that surrounds the organ of hearing.
Identify J & function

Page 479
to nasopharynx
Identify K

Page 479
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)
Vestibulocochlear nerve

--part of the inner ear that provides equilibrium sensations by detecting rotation, gravity and acceleration.
Identify M & function

Page 479 (Picture) & 484(Text)
Facial nerve
Identify N

Page 479
Petrous part of temporal bone
Identify O

Page 479
Semicircular canals
Identify P

Page 479
Auditory ossicles

-Tiny ear bones (smallest bones in the body)
-Connect the tympanic membrane with the receptor complex of the inner ear
Identify Q

Page 479
1.) Malleus
2.) Incus
3.) Stapes
What are the three auditory ossicles called?
Malleus
Identify A

Page 479-480
Incus
Identify B

Page 479-480
Stapes

--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.
Identify C

Page 479-480
Semicircular Canals and Ducts
Be able to identify: bony labyrinth, all 3 semicircular ducts, vestibule, cochlea, cochlear duct, endolymph and perilymph
Bony labyrinth
Identify this figure.

Page 482
Semicircular ducts
Identify S

Page 482
Anterior duct
Identify P

Page 482
Lateral duct
Identify Q

Page 482
Posterior duct
Identify R

Page 482
Semicircular canal
Identify T

Page 482
Vestibule
Identify O

Page 482
Cochlea
Identify K

Page 482
Cochlear duct
Identify H

Page 482
Endolymph
Identify C

Page 482
Perilymph.
Identify A

Page 482
Know these parts of the eye
Be able to identify these parts:

1. ciliary body
2. suspensory ligaments
3. aqueous humor
4. cornea
5. iris
6. lens
7. optic nerve
8. retina
9. vitreous humor
Ciliary body
Identify I
Cornea
Identify K
Lens
Identify L
Iris
Identify N

Page 493 & 495
Posterior chamber/vitreous humor

--filled with aqueous humor
Identify O

Page 493
Suspensory ligaments
Identify Q
Optic nerve
Identify W
Retina
Identify O

Page 494
Aqueous Humor
Identify J
Cornea
Identify 1
sclera
Identify 2
Optic Nerve
Identify 3
Pupil
Identify 5
Tapetum (cow only)
Identify 9
Vitreous Humor
Identify 10
Lens
Identify 11
Retina
Identify A
Choroid
Identify A
Ciliary Muscle
Identify B
Iris
Identify C