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

EX1; Formation of Face and Oral Cavity Flashcards

1
Q

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

A

face
tongue
oral cavity

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2
Q

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

A

formation

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3
Q

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

A

growth

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4
Q

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

A

development

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5
Q

During which embryonic weeks does the face develop

A

three to five

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6
Q

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

A

3mm

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7
Q

The stomodeum appears during which embryonic week

A

three

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8
Q

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

A

nasal and oral cavity

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9
Q

What are the boundaries of the stomodeum

A 
frontal prominence (superior)
cardiac plate (inferior)
buccopharyngeal membrane (posterior)
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10
Q

What type of epithelium lines the stomodeum

A

ectoderm

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11
Q

What type of epithelium makes up the buccopharyngeal membrane

A

2 layers; endoderm and ectoderm

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12
Q

During the fourth week what appears

A

4 pairs branchial (pharyngeal, visceral) arches

branchial clefts or grooves

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13
Q

When do the branchial arches disappear

A

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

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14
Q

*What does branchial Arch 1 become

A

right and left maxillary facial processes

right and left mandibular facial processes

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15
Q

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

A

external auditory meatus

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16
Q

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

A

commissure laborium oris (corner of lips)

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17
Q

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

A

2 mandibular facial processes

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18
Q

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

A

2 maxillary facial processes

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19
Q

These appear within the frontal prominence during the 4th week

A

nasal pits

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20
Q

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

A

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

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21
Q

The nasal pits deepen and become what

A

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

22
Q

What does the median nasal process become

A

midline of nose

philtrum of upper lip

23
Q

What do the lateral nasal processes become

A

lateral sides and ala (wings) of nose

infraorbital part of face

24
Q

What does the maxillary process become

A

upper part of cheeks

lateral parts of upper lip

25
Q

What does the mandibular process become

A

lower part of cheeks
lower lip
chin

26
Q

What do the maxillary processes merge with

A

median nasal process

27
Q

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

A

clefting (unilateral or bilateral) of the upper lip

28
Q

What does branchial arch II become

A

operculum (cover)

29
Q

What is the operculum

A

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

30
Q

What does the operculum become

A

sides of neck below the external auditory meatus

31
Q

This takes place between the facial processes during facial formation

A

merging

32
Q

When would clefting in the mandible appear

A

by the 5th week, if merging does not occur

33
Q

What makes up the upper lip

A

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

34
Q

What makes up the lower lip

A

right and left mandibular process

35
Q

What happens to the buccopharyngeal membrane

A

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

36
Q

What appears during the 4th becoming the tongue

A

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
Q

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

A 
tuberculum impar (middle)
2 lateral lingual
38
Q

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

A

copula

39
Q

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

A

6th week

40
Q

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

A

primary palate

41
Q

This arises from the primary palate during the 5th week

A

nasal septum

42
Q

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

A

palatine folds

43
Q

What type of epithelium covers the palatine folds

A

lining epithelium connects to an underlying mesenchymal tissue

44
Q

The palatine folds move from a vertical position to where

A

a horizontal position above the tongue

45
Q

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

A

“Y”

46
Q

When does the palate epithelium begin to fuse

A

begins in the 6th week

47
Q

How does palate fusion progress

A

posterior;

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

48
Q

Where does meschenchyme remain after palatal merging

A

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

49
Q

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

A

the oral and nasal cavities

50
Q

When does epithelial fusion and mesenchymal union occur

A

between 6th and 8th weeks

May14 Oral Histology (25 decks)

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