chapter 16 terms

Question 1

derived from 1st pharyngeal pouch

Answer 1

tubotympanic recess (auditory tube + tympanic cavity)

Question 2

derived form cartilage of 1st pharyngeal arch

Answer 2

malleus and incus

Question 3

derived form cartilage of 2nd pharyngeal arch

Answer 3

stapes

Question 4

derived form distal part of 1st pharyngeal groove

Answer 4

external acoustic meatus

Question 5

proliferation of deep cells to form a solid plate of epithelial cells

Answer 5

meatal plug

Question 6

meatal plug cells partially degenerate&raquo_space; only tympanic membrane left

Answer 6

late fetal period

Question 7

mesenchymal prominences of 1st and 2nd pharyngeal arches that give rise to auricle

Answer 7

auricular hillocks

Question 8

common and can be indicators of broader patterns of birth defects

Answer 8

auricular deformities

Question 9

absence of auricles

Answer 9

anotia

Question 10

small auricles – suppressed development of auricular hillocks&raquo_space; often associated with deformities of external acoustic meatus and middle ear

Answer 10

microtia

Question 11

skin tags resulting from abnormal auricle development/migration&raquo_space; may contain a piece of cartilage

Answer 11

auricular appendages

Question 12

auricle properly formed but not positioned relative to external auditory canal

Answer 12

upper auricular detachment

Question 13

from malformation of external or middle ear

Answer 13

conducting deafness

Question 14

from malformation of inner ear

Answer 14

sensineural deafness

Question 15

malformation of organ of Corti

Answer 15

Rubella

Question 16

most common cause with multiple genes involved

Answer 16

genetic