Lecture 1: Formation of Face, Tongue, and Oral Cavity

Question 1

what is the timeline of formative events?

Answer 1

• formation of face
• formation of tongue
• formation of palate and oral cavity

Question 2

organizational level involved in the growth and development of an organ in an organ system

Answer 2

formation

Question 3

inc. in weight and spatial dimension (shape) that an organ or organism undergo

Answer 3

growth

Question 4

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

Answer 4

development

Question 5

in what week is there a “crown and rump” at the stomodeum (becomes oral and nasal cavities)?

Answer 5

3rd week

Question 6

borders of the stomodeum during the 3rd embryonic week

Answer 6

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

Question 7

in what week do the pharyngeal arches appear and disappear?

Answer 7

4th

Question 8

what does arch one become?

Answer 8

right and left max facial processes and right and left mandibular facial processes

Question 9

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

Answer 9

commissura labiorum oris

Question 10

what replaces the cardiac plate as the lower boundary of the stomodeum

Answer 10

mandib facial processes

Question 11

what becomes the posteriolateral boundaries of the stomodeum

Answer 11

max facial processes

Question 12

the nasal pits appear where?

Answer 12

frontal prominence

Question 13

what 3 of the 7 facial processes are formed by the frontal prominence

Answer 13

1- medial nasal prominence
2- right lateral nasal prominence
3- left lateral nasal prominence

Question 14

what 4 of the 7 facial processes are formed by the brachial arch I

Answer 14

• right/left max processes

- right/left mandib processes

Question 15

what do the max processes become?

Answer 15

• upper part of cheeks

- lateral parts of upper lips

Question 16

what do the mandib processes become?

Answer 16

• lower part of cheeks
• lower lip
• chin

Question 17

what does cleft I become?

Answer 17

external auditory meatus

Question 18

from what arch does the operculum arise from?

Answer 18

II (it becomes the neck below the external auditory meatus)(good place for cyst)

Question 19

what does the operculum cover?

Answer 19

arches III and IV and clefts II, III, and IV

Question 20

during what week does merging take place between the facial processes?

Answer 20

4th

Question 21

bilateral and unilateral clefts occur if there is no merging by what week?

Answer 21

5th

Question 22

what does the median nasal prominence become?

Answer 22

middle of the nose and philtrum

Question 23

formation of the tongue and the rupturing of the buccopharyngeal membrane all occurs in what week?

Answer 23

4th

Question 24

what 4 lingual swellings merge to become the tongue

Answer 24

• right/left lateral lingual swelling
• tuberculum impar
• copula

Question 25

what is the only lingual swelling that is not derived from arch one

Answer 25

copula (second and third arch)(post. 1/3 of the tongue)

Question 26

the partitioning of the stomodeum into the oral and nasal cavities occurs during what week?

Answer 26

6th

Question 27

where does the primary palate arise?

Answer 27

inner surface of median facial process

Question 28

where does the nasal septum arise?

Answer 28

primary palate

Question 29

where do the palatine folds arise?

Answer 29

inner surface of max facial processes

Question 30

the palatine folds have lining epithelium that is connected to an underlying mesenchymal tissue also called ____

Answer 30

ectomesenchyme (originates in ectoderm primary germ layer)

Question 31

during what week week is there epithelial fusion between the primary palate and the palatine folds?

Answer 31

6th