HY embryo II

Question 1

1st arch derivatives of ear

Answer 1

malleus
incus
tensor tympani

Question 2

2nd arch derivatives of ear

Answer 2

stapes

stapedius

Question 3

1st cleft derivatives of ear

Answer 3

external acoustic meatus

Question 4

1st pouch derivatives of ear

Answer 4

pharyngotympanic tube

middle ear cavity

Question 5

otic placode derivatives of ear

Answer 5

membranous labyrinth in inner ear

Question 6

tympanic membrane forms at interface of …

Answer 6

1st pouch and cleft

Question 7

hyoid bone

arch?

Answer 7

upper pt: 2nd arch

lower pt: 3rd arch

Question 8

taste buds/mucosa of tongue is derived from which pharyngeal arches?

Answer 8

1st-4th pharyngeal arches

*NOT muscles

Question 9

epiglottis

arch?

Answer 9

4th arch

Question 10

posterior 1/3 tongue

arch?

Answer 10

3rd arch

Question 11

anterior 2/3 tongue (gen sensory)

arch?

Answer 11

1st arch

Question 12

anterior 2/3 tongue (taste)

arch?

Answer 12

2nd arch

Question 13

Are tongue muscles are derived from pharyngeal arches?

Answer 13

NO

derived from occipital somites

Question 14

middle ear (tympanic cavity) is derived from the extension of which pharyngeal pouch?

…therefore continuous w/ what?

Answer 14

1st pharyngeal pouch

therefore continuous anteriorly w/ pharynx via pharyngotympanic tube and posteriorly w/ mastoid air cells