Ch 9 The Outer Ear

Question 0

Tragus

Answer 0

A fold of skin that can be used to close off the external auditory meatus.

Question 1

Pinna or Auricle

Answer 1

The part of the outer ear that channels sound into the external auditory meatus to the tympanic membrane.

Question 2

External Auditory Canal or Meatus

Answer 2

The ear canal

Question 3

Cerumen

Answer 3

Earwax

Question 4

Otalgia

Answer 4

Ear pain

Question 5

Tympanic Membrane

Answer 5

A concave, disk-like structure at the end of the external auditory meatus that transfers acoustic energy into mechanical energy by vibrating in reaction to sound waves.

Question 6

Malleus

Answer 6

The largest middle ear bone. This bone is attached to the tympanic membrane at the manubrium and attached to the incus at the head.

Question 7

Umbo

Answer 7

The point of greatest retraction on the tympanic membrane.

Question 8

Otoscope

Answer 8

A tool used to illuminate, magnify, and examine the tympanic membrane

Question 9

Annulus

Answer 9

A ring of tissue that holds the tympanic membrane in position in the external auditory meatus.

Question 10

Pars Flaccida

Answer 10

Loose tissue at the top of the tympanic membrane above the malleus.

Question 11

Pharyngeal Arches

Answer 11

Bulges that appear on either side of the tissue that will develop into the head and neck in an embryo.

Question 12

Pharyngeal Arch Layers

Answer 12

Ectoderm: Outer Layer
Entoderm: Inner Surface
Mesoderm: Inner Core

Question 13

Mesenchyme

Answer 13

Embryonic tissue that later forms the connective tissues of the body, as well as the blood vessels and the lymphatic vessels.

Question 14

Microtia

Answer 14

When one or both auricles are very small compared to normal sized auricles.

Question 15

Anotia

Answer 15

When the auricle is entirely absent

Question 16

Otic Atresia

Answer 16

When the cartilaginous portion, or the entirety of the external auditory meatus has not formed

Question 17

External Otitis

Answer 17

An infection that occurs in the skin of the external auditory canal. Often called swimmer’s ear.

Question 18

Otomycosis

Answer 18

A fungal external ear infection often caused by overuse of eardrops

Question 19

Furunculosis

Answer 19

Infection of hair follicles in the EAM

Question 20

Myringitis

Answer 20

Inflammation of the TM

Question 21

Exostoses

Answer 21

The outward projections for surfaces of bone. Sometimes seen in the EAM, causing a conductive hearing loss.

Question 22

Pressure-Equalizing Tubes (PE Tubes)

Answer 22

Tubes placed in the TM to allow drainage and pressure equalization of the middle ear.

Question 23

Cerumenolytic

Answer 23

A chemical substance known to safely soften earwax.

Question 24

Myringoplasty

Answer 24

Surgical repair of a perforated tympanic membrane.

Question 25

Tympanosclerosis

Answer 25

Thickening of the tympanic membrane due to calcium plaque building up on the TM