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Oral Histology > Formation of the Face, Tongue, and Oral Caviy > Flashcards

Formation of the Face, Tongue, and Oral Caviy Flashcards

1
Q

Formation definition

A

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

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2
Q

Growth definition

A

Increase in weight and spatial dimensions that an organ or organism undergo

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3
Q

Development definition

A

The growth of an organ or organism through various morphologic stage on its way to maturity

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4
Q

When does the formation of the face occur?

A

Weeks 3-5

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5
Q

What occurs during the third embryonic week?

A

The Stomodeum appears

Crown to rump measurment is 3mm

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6
Q

Stomodeum

A

Becomes the nasal and oral cavities between 6th-8th weeks

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7
Q

Boundaries of the Stomodeum

A 
Superior = Frontal Prominence
Inferior = Cardiac plate
Posterior = Buccopharyngeal membrane
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8
Q

What happens in the 4th embryonic week?

A

Branchial arches and clefts appear (and disappear)

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9
Q

Arch I

A

Becomes the right and left maxillary facial processes as well as the right and left mandibular facial processes

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10
Q

Comissura laborium oris derives from…

A

Derives from the place where the upper maxillary and lower mandibular processes meet at either side

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11
Q

Brachial cleft I becomes…

A

External acoustic meatus

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12
Q

Brancial cleft II becomes…

A

Eustachian tube

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13
Q

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

A

Right and Left mandibular facial processes

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14
Q

What becomes the posterolateral boudaries of the stomodeum?

A

Maxillary facial processes

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15
Q

What happens when the nasal pits appear?

A

The frontal prominence becomes 3 processes:

  • Right and Left lateral nasal facial processes
  • Median nasal facial process
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16
Q

What replaces the frontal prominence as the superior border of the stomodeum?

A

Right and left lateral nasal facial processes

Median nasal facial process

17
Q

Fate of the median nasal facial process

A

Midline of the nose

Philtrum of the upper lip

18
Q

Fate of the lateral nasal processes

A

Lateral sides and ala of the nose

Infraorbital part of the face

19
Q

Fate of the maxillary process

A

Upper part of the cheeks

Lateral parts of the upper lip

20
Q

Fate of the mandibular process

A

Lower part of the cheeks
Lower lip
Chin

21
Q

Fate of Arch II

A

Becomes an embryonic fold called the Operculum

22
Q

Operculum

A

Covers arches III and IV as well as clefts II, III, IV

Becomes the sides of the neck below the external auditoy meatus

23
Q

What is the significance of the groove that forms between the maxillary and median nasal prominences?

A

It extends into the stomodeum
If the maxillary facial processes do not merge with the median nasal facial processes, it causes unilateral or bilateral clefting of the upper lip

24
Q

What is the fate of the Buccopharyngeal membrane

A

It ruptures, allowing the opening to the foregut, which becomes the nasal and oral pharynx
Site of the anterior pillar of fauces

25
Q

When does formation of the tongue occur?

A

4th embryonic week

26
Q

What stars tongue formation?

A

Four lingual swellings appear along the ventral, inside surface of the mandibular proccesses and branchial arches I, II, and III

27
Q

What occurs after the buccopharyngeal membrane ruptures?

A

The 4 lingual swellings merge to form the tongue

28
Q

What are the 4 lingual swellings

A

Tuberculum impar
2 Lateral lingual swellings
Copula

29
Q

What becomes the anterior 2/3 of the tongue?

A

Tuberculum impar and 2 lateral lingual swellings

30
Q

What becomes the posterior 1/3 of the tongue?

A

Copula

31
Q

What is the tongue’s position in the 5th week?

A

In the stomodeum

32
Q

When does the palate start to form?

A

5th week

33
Q

What structures enter into formation of the palate

A

Primary palate
Nasal septum
Palatine folds

34
Q

Primary palate

A

Arises from the inner surface of the medial nasal facial processes

35
Q

Nasal septum

A

Arises from the primary palate

36
Q

Palatine folds

A

Arise form the inner surface of maxillary facial processes

Have lining epithelium that is connected to an underlying mesenchyme

37
Q

How does the palate begin to form?

A

Palatine folds move from a vertical position lateral to the tongue, to a horizontal position above the tongue, creating a ‘Y’ with the edges of the anterior portion of the palatine folds and the primary palate. Mesenchyme tissues of the palatine folds and the nasal septum flow towards each other, this causes the lining epithelia of structures nasal and palatine folds to approach eachother.

38
Q

What occurs in the 6th embryonic week?

A

Palatine epithelial fusion

39
Q

Palatine epithelial fusion

A

Epithelia of the primary palate and palatine folds fuse and forms the arms of the ‘Y’
The fusion begins anteriorly and continues posteriorly

Oral Histology (12 decks)

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