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DH 101 > Chapter 5: Orofacial Development > Flashcards

Chapter 5: Orofacial Development Flashcards

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1
Q

What two structures does the palate form from?

A

primary palate and secondary palate

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2
Q

When is the palate fully completed?

A

12th week of fetal period

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3
Q

What are the 3 consecutive stages of palate formation

A

Formation of primary palate
Formation of secondary palate
Completion of final palate

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4
Q

What are the time periods of the 3 palate stages

A

Primary palate: 5th - 6th week
Secondary Palate: 6th - 12th week
Final palate: 12th week

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5
Q

What palatal structures are involved in the primary palate?

A

Intermaxillary segment from fused medial nasal processes

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6
Q

What palatal structures are involved in the secondary palate?

A

Fused palatal shelves from maxillary processes

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7
Q

What palatal structures are involved in the final palate?

A

Fusion of all three processes

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8
Q

The final palate involves what?

A

Fusion of swellings or tissue from different surface of the embryo

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9
Q

What forms during the 5th week?

A

Intermaxillary segment due to fusion of medial nasal processes

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10
Q

Intermaxillary segment aka … (2)

A

Globular processes
Primary palate (gives rise)

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11
Q

Premaxillary part of the maxilla is also the …

A

Anterior 1/3rd of the hard palate

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12
Q

What does the anterior 1/3rd of hard palate contain?

A

Maxillary anterior teeth (incisors)

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13
Q

When does secondary palate formation occur

A

During 6th week

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14
Q

What happens to maxillary process in week 6

A

Gives rise to two palatal shelves

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15
Q

Palatal shelves aka..

A

Lateral palatine processes

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16
Q

Explain how and where palatal shelves grow and develop

A

Grows inferiorly and vertically inside the stomodeum, along sides of developing tongue

17
Q

How is the secondary palate formed

A

When 2 palatal shelves elongate, move medially towards each other and fuse

18
Q

What is the posterior 2/3rd of the hard palate consists of

A

Secondary palate
Canines and posterior teeth

19
Q

What does the secondary palate give rise to?

A

Posterior 2/3rds of hard palate, soft palate, uvula

20
Q

What is the median palatine raphe

A

Line on the palate of maxillary bone that indicates fusion of palatal shelves

20
Q

What is the median palatine raphe

A

Line on the palate of maxillary bone that indicates fusion of palatal shelves

21
Q

What happens after the final palate is formed

A

Oral cavity becomes completely separated from nasal cavity

22
Q

How does a cleft palate occur

A

failure of fusion of palatal shelves with primary palate

23
Q

What structure develops during the same time frame as the palate

A

Nasal cavity

24
Q

What week does the tongue develop

A

Week 4

25
Q

How does the tongue begin to develop

A

Begins as a triangular median swelling

26
Q

What is the tuberculum impar

A

Median tongue bud

27
Q

Median lingual sulcus

A

Superficial demarcation of line of fusion of two lateral lingual swellings

28
Q

What does the degeneration of cells around lingual swellings form?

A

A sulcus

29
Q

What does the formation of sulcus mean in the tongue development

A

Body of tongue is freed from the floor of the mouth except for a small attachement

30
Q

What is the midline lingual frenum

A

attachment in floor of mouth that attaches the tongue to the floor

31
Q

What is the copula

A

Pair of swellings
Becomes posterior 1/3rd of tongue (base of tongue)

32
Q

Epiglottic swelling marks…

A

Marks the development of most posterior region of tongue and site of future epiglottis

33
Q

Sulcus terminalis

A

inverted V-shape groove on dorsal surface of tongue
Marks the border between the base of tongue and its body

34
Q

Foramen cecum

A

beginning of thyroglossal duct
site of development of thyroid gland

35
Q

What does the thyroglossal duct show

A

origin of thyroid gland and migration pathway of thyroid gland into the neck region

36
Q

Where does thyroid gland form

A

Inferior terminus

37
Q

What part of the tongue forms during 4th-8th weeks

A

Body: tuberculum impar and lateral lingual swellings appear
Base: Copula overgrowing second branchial arches

38
Q

What part of the tongue forms during the 9th week

A

Completed tongue: merging of anterior swellings of body and copula base

DH 101 (11 decks)

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