Lecture 20

Question 1

the frontonasal prominence consists of what neural crest cells?

Answer 1

forebrain and midbrain

Question 2

what are the four components of the pharyngeal region?

Answer 2

pharyngeal pouches, thyroid diverticulum, pharyngeal grooves, pharyngeal arches

Question 3

neural tube gives rise to the neural ___ ___?

Answer 3

crest tissue

Question 4

pharyngeal endoderm patterning is heavily based on exposure to what?

Answer 4

RA

Question 5

the first pharyngeal pouch is not dependent on RA but on?

Answer 5

Otx2

Question 6

second pouch is kind of dependent on this, and third and fourth are heavily dependent on __?

Answer 6

RA

Question 7

this gene heavily influences the dorsoventral patterning of the pharyngeal arches?

Answer 7

Dlx

Question 8

arch 1 ectoderm uses this gene to single migrating neural crest cells and influence development of arch 1?

Answer 8

Edn-1

Question 9

frontonasal ectoderm zone is induced by this gene from the forebrain?

Answer 9

Shh

Question 10

what two processes make up the primordia for jaws?

Answer 10

maxillary and mandibular

Question 11

this is a slender, elongated cartilaginous rod that develops within the first arch. the mandible forms around it and it contains two derivatives, articular and quadrate.

Answer 11

meckel’s cartilage

Question 12

this is a synovial joint with an articular disk, and the formation involves the early expression of Barx-1.

Answer 12

temporomandibular joint

Question 13

quadrate bone moves into the middle ear and becomes the

Answer 13

incus

Question 14

articular bone moves into the middle ear and becomes the

Answer 14

malleus

Question 15

this part of the nose requires Pax6 and retinoids and develops from the anterolateral edges of neural plate

Answer 15

nasal placodes

Question 16

this part of the nose is an invagination of nasal placodes and is a source of retinoids that stimulate FGF-8, also they deepen to form choanae

Answer 16

nasal pits

Question 17

this part of the nose is derived from the dorsal epithelium of nasal pits and requires FGF-8

Answer 17

olfactory epithelium

Question 18

what are the 5 stages of tooth development? which stage contains the enamel organ and dental papilla?

Answer 18

dental lamina, tooth bud, cap stage, bell stage, dental sac. bell stage.

Question 19

the enamel organ gives rise to the

Answer 19

ameloblasts

Question 20

the dental papilla gives rise to the

Answer 20

odontoblasts

Question 21

this stage is C shaped bands or oral ectoderm

Answer 21

dental lamina

Question 22

this stage marks the position of a single tooth

Answer 22

tooth bud

Question 23

this stage in an inverted cup shaped layer of ectoderm

Answer 23

cap stage

Question 24

this stage is cone shaped primordium organ contains enamel organ and dental papilla

Answer 24

bell stage

Question 25

this stage will form a periodontal ligament

Answer 25

dental sac

Question 26

branching pattern of salivary glands depends heavily on what gene

Answer 26

Shh

Question 27

for salivary gland development, the signaling between what two genes occurs between within the epithelium

Answer 27

Shh and FGF