Anatomy of Ear

Question 1

Four parts of Temporal Bone

Answer 1

Squamous, mastoid, tympanic, petrous

Question 2

Squamous portion

Answer 2

Thin, bony plate on lateral wall

Question 3

Mastoid

Answer 3

Fairly thick, has air-filled spaces

Question 4

Tympanic portion

Answer 4

Floor and wall of ear canal

Question 5

Petrous Portion

Answer 5

houses the sensory organs of hearing and balance

Question 6

VIII Nerve

Answer 6

passes through internal auditory meatus

Question 7

Outer ear

Answer 7

Pinna, EAM, and lateral TM

Question 8

EAM

Answer 8

Skeleton medially, Cartilaginous laterally

Question 9

Measurement of External Auditory Canal

Answer 9

Horiz diameter of 6 mm, Vert diam of 9 mm, 23-25 mm in length

Question 10

Tympanic Membrane thickness and diameter

Answer 10

.1 mm thin, vert dia 9-10 mm, horiz 8-9 mm

Question 11

Inward displacement of TM

Answer 11

2 mm, peak called Umbo

Question 12

Pars Tensa layers

Answer 12

Epidermis, connective tissue, radial and circular fibers, connective tissue, mucosa

Question 13

Pars Flaccida

Answer 13

Everything except radial and circular fibers

Question 14

Umbo

Answer 14

Coincides with tip of manubrium of the malleus (1:00 in right ear, 11:00 in left)

Question 15

Stapedius connects to

Answer 15

Stapes

Question 16

Tensor Tympani connects to

Answer 16

manubrium of malleus, pulls medially

Question 17

Attic of middle ear

Answer 17

communicates with mastoid air cell system

Question 18

Three ossicles

Answer 18

Malleus, incus, and stapes

Question 19

Stapes

Answer 19

Smallest bone in human body

Question 20

Malleus

Answer 20

9 mm in length, tip of manubrium connects to TM

Question 21

Tympanic Muscle

Answer 21

encased in bony canals except for tendon

Question 22

Articular Facet on Malleus

Answer 22

Forms joint with af of incus

Question 23

End of long process of incus

Answer 23

articulates with head of stapes

Question 24

Stapes attached to oval window by

Answer 24

annular ligament

Question 25

Stapedius tendon

Answer 25

pulls stapes posteriorly

Question 26

Eustachian Tube

Answer 26

Communicates ME with Nasopharynx

Question 27

Portions of ET

Answer 27

Bony, isthmus, cartilaginous

Question 28

Cartilaginous Portion of ET

Answer 28

Normally closed, opens with swallowing, yawning, sneezing

Question 29

Function of Eustachian tube, Auditory Tube

Answer 29

permit ME pressure to equalize with external air, permit drainage of ME secretions

Question 30

Tensor veli palatini muscle

Answer 30

Pulls wall of auditory tube laterally during swallowing

Question 31

ET in Adults

Answer 31

Rigid, and sloping to drain

Question 32

ET in Children

Answer 32

Horizontal and lacks rigidity