Formation of Face and Oral Cavity

Question 1

formation

Answer 1

an organization level involved in the growth and development of an organ and an organism

Question 2

growth

Answer 2

increase in weight and spatial dimensions (shape_ that an organ or organism undergo

Question 3

development

Answer 3

the growth of an organ or organism through various formative stages on its way to maturity

Question 4

when does the stomodeum first appear?

when does it become the nasal and oral cavities?

Answer 4

3rd week

beween 6th and 8th week

Question 5

what are the boundaries of stomodeum during 3rd embrunic week

Answer 5

superior: frontal prominence
inferior: cardiac plate
posterior: buccopharyngeal membrane

Question 6

what does arch 1 become during 4th week?

Answer 6

right and left max facial processes

right and left mand facial processes

Question 7

where is the commisura labiorum oris?

Answer 7

where the upper maxillary and lower mandibular processes meet at either side of stomodeum

Question 8

what are the new boundaries of stomodeum in the 4th week?

Answer 8

2 mand facial processes replace the cardiac plate as lower boundary of stomodeum
2 max facial processes becomes the posterolateral boundaries of stomodeum

Question 9

what appears within and the frontal prominence and what three processes does the frontal prominence become in 4th week?

Answer 9

nasal pits

median nasal facial process and right and left lateral nasal facial process

Question 10

what happens to the nasal pits?

Answer 10

deepens and become nasal ducts that open into the stomodeum. the ducts become nostrils that open into nasal cavities during formation of nasal and oral cavities

Question 11

what does outer surfaces of median nasal process become?

Answer 11

midline of nose

philtrum of upper lip

Question 12

what does outer surfaces of lateral nasal processes become?

Answer 12

lateral side and ala of nose

infraorbital part of face

Question 13

what does outer surfaces of maxillary processes become?

Answer 13

upper part of cheeks

lateral parts of upper lip

Question 14

what does outer surfaces of mandibular processes become?

Answer 14

lower part of cheeks
lower lip
chin

Question 15

what does the first arch cleft become?

Answer 15

external auditory meatus

Question 16

what does branchial arch 2 become?

Answer 16

an embryonic fold of tissue called operculum

Question 17

what does operculum cover and what does it become

Answer 17

covers arches 3 and 4 and clefts 2, 3,4

operculum becomes sides of neck below external auditory meatus

Question 18

what happens if max facial process do not merge with median nasal facial process by 5th embryonic week?

Answer 18

unilateral or bilateral clefting of the upper lip

Question 19

what happens if mandibular processes do not merge with each other by 5th embryonic week

Answer 19

clefting of lower jaw occurs

Question 20

how many facial processes form the upper lip?

Answer 20

3
right max facial process
median nasal faacial process
left max facial process

Question 21

how many facial processes form the lower lip?

Answer 21

2
right mandibular process
left mandibular process

Question 22

what is the fate of the 3 boundaries of stomodeum?

Answer 22

1. frontal prominence become left and right lateral facial process and median nasal facial process
2. cardiac plate replaced by mandbular facial processes during 4th week
3. buccopharyngeal membrane ruptures allowing opening to the foregut that becomes the nasal and oral pharynx. site of anterior pillar of fauces

Question 23

what are lingual swellings?

Answer 23

4 lingual swellings appear during 4th week along the ventral insude surface of mandibular process of branchial arch 1+ arch 2,3.

Question 24

what is the fate of 4 lingual swellings

Answer 24

buccopharyngeal membrane ruptures in 4th week and lingual swellings become tongue

Question 25

name of 4 lingual swellings and contributions to tongue

Answer 25

tuberculum impar and 2 lateral lingual swellings become anterior 2/3 of tongue
copula become psoterior third or root of tongue

Question 26

when does the appearance of structures within stomodeum that enter into formation of palate occur?

Answer 26

5th embryonic week

Question 27

what does the primary palate arise from?

Answer 27

inner surface of median nasal facial process

Question 28

what does the nasal septum arise from

Answer 28

primary palate

Question 29

what does palatine folds arise from

Answer 29

inner surface of maxillary facial processes

Question 30

what happens to the palatine folds in 5th week?

Answer 30

move from a vertical position to a horizontal position above the tongue

Question 31

what happens to palatine folds and nasal septum?

Answer 31

mesenchyme tissue of palatine folds and nasal septum flow toward each other and the lining epithelia of structures n and p approach each other

Question 32

when does the epithelial fusion of primary palate and palatine folds occur?

Answer 32

start 6th week

Question 33

what direction does epithelial fusion progress

Answer 33

posteriorly

Question 34

stages of secondary palate formation

Answer 34

first: fusion of primary palate and palatine folds
then palatine folds with each other and nasal septum
then break up of fused epithelium and start of intermingling of mesenchymal cells

Question 35

when does epithelial fusion and mesenchymal union occur?

Answer 35

between 6th and 8th week IU