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oral histology > Histogenesis of Face: Tongue: oral Cavity > Flashcards

Histogenesis of Face: Tongue: oral Cavity Flashcards

1
Q

The formation of different tissues from stem cells that are constituents of the primary germ layers

A

Histogenesis

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2
Q

Timeline of Formative events

A

Formation of Face
Formation of the Tongue
Formation of Palate (primary and secondary) with formation of the oral cavity

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3
Q

an organization level involved in the growth and deveolopment of an organ and an organism
The way a particular spatial arrangement (shape) of something occurs

A

Formation

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4
Q

Increase in weight and spatial dimensions (shape) that an organ and orgnaism undergoew

A

GRowth

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5
Q

The growth of an organ or organism through various formative stages on the way to maturation

A

Development

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6
Q

what must occure before growth

A

Formation

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7
Q

TImeline for the formation of the face

A

3-5 weeks

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8
Q

Crown to rump measurement at wek 3

A

3mm

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9
Q

what is the stomodeum

A

Depression between the brain and pericardium in an embryo

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10
Q

when does the stomodeum appear

A

3rd embryonic wek

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11
Q

what does the stomodeum eventually become

A

The nasal and oral cavities

Rathke’s rouch

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12
Q

What does Rathke’s pouch eventually become

A

Precursor of the anterior lobe of the pituitary

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13
Q

Superior
Inferior
Posterior boundries of the stomodeum

A

Frontal prominence
Cardiac Plate
Buccopharyngeal membrane

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14
Q

what makes up the outer and inner surface of the buccopharyngeal membrane

A

Outer: ectoderm
Inner: endoderm

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15
Q

when do Branchial arches and clefts appear and disappear

A

In the 4th week of embryonic development

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16
Q

what does Arch 1 become

A

Right and Left Maxillary facial processes

Right and left mandibular facial processes

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17
Q

ectomesenchyme

A

Mesenchymal tissues in the branchial arches that originates in the ectoderm

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18
Q

size of mandibular and maxillary processes

A

Maxillary is very large

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19
Q

what separates the arches

A

Branchial clefts, named as the arch above is named

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20
Q

the major difference in ectomesenchym and mesenchyme

A

Ectomesenchym is from neural crest cells from the ectoderm germ layer

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21
Q

where does ectomesenchyme form

A

in the cranial region

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22
Q

what does ectomesenchyme help to form

A

Hard and soft tissues of head and neck (bones, muscle, tooth tissues (denin, cementum, pulp)

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23
Q

what does Ectomesenchyme not form in the tooth

A

not enamel (from the ectoderm in the stomodeum)

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24
Q

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

A

Commissura labiorum oris

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25
Q

what does the mandibular facial process replace in week 4

A

The cardiac plate as the lower boundry of the stomodeum

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26
Q

What does the maxillary facial process eventually become in the embryo in week 4

A

The posteriolateral boundaries of the stomodeum

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27
Q

where do nasal pits from

A

within the frontal prominence

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28
Q

what does the nasal pits form in the frontal prominence

A

Median and R and L nasal facial processes

29
Q

the Median And R and L nasal facial processes replace what

A

Frontal prominence and the superior boundry of the stomodeum

30
Q

what do the nasal pits eventally become

A

nasal ducts that open into the stomodeum to eventually from the nasal cavities and notrils

31
Q

what does the frontal promince and branchial arch I become

A

FP: Media, R and L nasla processes

Branchial arch I: R and L maxillary, R and L mandibular

32
Q

what does the median nasal process become

A

Midline of nose

Philtrum of upper lip

33
Q

What does the lateral nasal process become

A

Lateral sides of ala of nose

Infraorbital parts of face

34
Q

what do the maxillary processes become

A

Upper parts of cheeks

Lateral parts of Upper lip

35
Q

what does the mandibular process come

A

Lower parts of cheek
Lower lip
Chin

36
Q

what does Branchial cleft I become

A

external Auditory meatus

37
Q

what does Branchial arch II become

A

Operculum

38
Q

what does the Operculum cover

A

Arch III and IV

Cleft II, III, and IV

39
Q

what does the operculum become

A

Sides of neck below the external auditory meatus

40
Q

what might the operculum cover in the teenage human

A

The 3rd molars and may become infected

41
Q

what happens if the operculum does not fully fuse

A

Left with cervical cysts

42
Q

what parts of the face grow the fastest

A

The upper face grows fast

43
Q

How do the Facial processes meet at week 4

A

Merge but do not fuse

44
Q

what happens to the groove between the maxillary and median nasal process

A

Gradually eliminated

45
Q

what happens if the maxillary process or precesses do not merge with the median nasal process by week 5

A

unilateral or bilateral clefting

46
Q

can the mandible cleft

A

Yes, but it is rare

47
Q

Crown to rump at week 8

A

30mm

48
Q

what happens to the buccopharyngeal membrane

A

Ruptures in fourth embryonic week allowing opening to the foregut
- becomes the nasal and oral pharynx

49
Q

where is the buccopharyngeal membrane in the adult

A

Pillar of fauces

50
Q

when does the tounge lingual swellings begin to form

A

week 4

51
Q

what are the lingual sweelings

A

R and L lateral welling
Tuberculum impar
Copula

52
Q

where do the lingual swellings form

A

mandibular process of brnahial arch I, II , and III

53
Q

when do the lingual swellings rupture

A

When the buccopharyngeal membrane ruptures during the 4th week

54
Q

what becomes the anterior 2/3 of the tongue

A

Tuberculum impar and the 2 lateral lingual swellings

55
Q

what bceomes the posterior 1/3 of the tongue (root)

A

Copula

56
Q

what does the primary palate arise from

A

The inner surface of the median nasal facial process

57
Q

what does the nasal septum arise from

A

The primary palate

58
Q

what do the palatine folds arise from

A

Inner surface of maxillary facial processes

59
Q

what do the palatine folds lining epithelial connect to

A

an underlying mesenchymal tisssue called ectomesenchyme

60
Q

when do the palatine folds go from vertical to horizontal possition above th tongue

A

Week 5

61
Q

what all flows toward each other to form the palate

A

Palatine folds and nasal septums

62
Q

how does lining epithelia of the palate act when they approach each other

A

mesenchyme grows until the epithelium Fuses

63
Q

when does the epithelium of the primary palate and palatine folds fuse

A

Sixth embryonic week

64
Q

how does the epithelium fuse in the palate

A

From the front of the mouth to the back

65
Q

how is the mesenchyme tissue separated first

A

Walled off by the epithelium in the palatine folds and the nasal septum

66
Q

break up of the fused epithelium in the palate leads to

A

Performated epithelium

67
Q

what happens to the perferated epithelium of the palate

A

Disappeares to form the secondary palate that is completely continuous

68
Q

what happens if the epithelium remains in the palate

A

Can form a cyst and clefts

69
Q

when does Epithelial fusion and mesenchymal union occur

A

6-8th week IU

oral histology (14 decks)

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