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General & Special Senses

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

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