EX1; Formation of Face and Oral Cavity Flashcards Preview

May14 Oral Histology > EX1; Formation of Face and Oral Cavity > Flashcards

Flashcards in EX1; Formation of Face and Oral Cavity Deck (50):
1

What is the order in which the face, oral cavity/palate, and tongue develop

face
tongue
oral cavity

2

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

formation

3

This is an increase in weight and spatial dimensions (shape) that an organ or organism undergoes

growth

4

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

development

5

During which embryonic weeks does the face develop

three to five

6

What is the crown-rump measurement during the 3rd week

3mm

7

The stomodeum appears during which embryonic week

three

8

What does the stomedeum become between the 6th and 8th week

nasal and oral cavity

9

What are the boundaries of the stomodeum

frontal prominence (superior)
cardiac plate (inferior)
buccopharyngeal membrane (posterior)

10

What type of epithelium lines the stomodeum

ectoderm

11

What type of epithelium makes up the buccopharyngeal membrane

2 layers; endoderm and ectoderm

12

During the fourth week what appears

4 pairs branchial (pharyngeal, visceral) arches
branchial clefts or grooves

13

When do the branchial arches disappear

in the 4th week (of when they appear also)

14

*What does branchial Arch 1 become

right and left maxillary facial processes
right and left mandibular facial processes

15

What does the groove (cleft 1) between the mandibular process and arch II become

external auditory meatus

16

What is the place where the maxillary and mandibular processes meet at either side of the stomodeum

commissure laborium oris (corner of lips)

17

This replaces the cardiac plate as the lower boundary of the stomodeum during the 4th week

2 mandibular facial processes

18

This becomes the posteriolateral boundary of the stomodeum during the 4th week

2 maxillary facial processes

19

These appear within the frontal prominence during the 4th week

nasal pits

20

*After the appearance of the nasal pits, the frontal prominence becomes what

three processes;
median nasal facial process
right lateral nasal facial process
left lateral nasal facial process

21

The nasal pits deepen and become what

nasal ducts that open into the stomodeum, then to nostrils that open to nasal cavities during the formation of oral and nasal cavities

22

What does the median nasal process become

midline of nose
philtrum of upper lip

23

What do the lateral nasal processes become

lateral sides and ala (wings) of nose
infraorbital part of face

24

What does the maxillary process become

upper part of cheeks
lateral parts of upper lip

25

What does the mandibular process become

lower part of cheeks
lower lip
chin

26

What do the maxillary processes merge with

median nasal process

27

Failure of the maxillary processes to merge by the end of the 5th week will result in what

clefting (unilateral or bilateral) of the upper lip

28

What does branchial arch II become

operculum (cover)

29

What is the operculum

an embryonic fold of tissue that covers arch III and IV and clefts II, III, and IV

30

What does the operculum become

sides of neck below the external auditory meatus

31

This takes place between the facial processes during facial formation

merging

32

When would clefting in the mandible appear

by the 5th week, if merging does not occur

33

What makes up the upper lip

right maxillary facial process
medial nasal facial process
left maxillary facial process

34

What makes up the lower lip

right and left mandibular process

35

What happens to the buccopharyngeal membrane

it ruptures allowing opening to the foregut that becomes the oral and nasal pharynx
site of the anterior pillar of fauces

36

What appears during the 4th becoming the tongue

four lingual swellings along the ventral inside surface of mandibular processes of branchial arch I, II, and III; the merge to form the tongue

37

These lingual swellings become the anterior 2/3 of the tongue

tuberculum impar (middle)
2 lateral lingual

38

This becomes the posterior 1/3 or root of the tongue

copula

39

After what week will the stomodeum portioned into the oral and nasal cavities

6th week

40

This arises from the inner surface of median nasal facial process during the 5th week

primary palate

41

This arises from the primary palate during the 5th week

nasal septum

42

This arises from the inner surface of maxillary facial process during the 5th week

palatine folds

43

What type of epithelium covers the palatine folds

lining epithelium connects to an underlying mesenchymal tissue

44

The palatine folds move from a vertical position to where

a horizontal position above the tongue

45

The edges of the palatine folds with the primary palate form what kind of shape

"Y"

46

When does the palate epithelium begin to fuse

begins in the 6th week

47

How does palate fusion progress

posterior;
the palate folds fuse with each other, then the nasal septum

48

Where does meschenchyme remain after palatal merging

in the confines walled off by epithelium of palatine folds and nasal septum
it intermingles within these structures

49

Upon the formation of the secondary palate (an the epithelium gone and mesenchyme union complete) what officially forms

the oral and nasal cavities

50

When does epithelial fusion and mesenchymal union occur

between 6th and 8th weeks