Formation of the Face, Tongue, and Oral Caviy Flashcards Preview

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

Flashcards in Formation of the Face, Tongue, and Oral Caviy Deck (39):
1

Formation definition

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

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Growth definition

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

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Development definition

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

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When does the formation of the face occur?

Weeks 3-5

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What occurs during the third embryonic week?

The Stomodeum appears
Crown to rump measurment is 3mm

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Stomodeum

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

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Boundaries of the Stomodeum

Superior = Frontal Prominence
Inferior = Cardiac plate
Posterior = Buccopharyngeal membrane

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What happens in the 4th embryonic week?

Branchial arches and clefts appear (and disappear)

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Arch I

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

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Comissura laborium oris derives from...

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

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Brachial cleft I becomes...

External acoustic meatus

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Brancial cleft II becomes...

Eustachian tube

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

Right and Left mandibular facial processes

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What becomes the posterolateral boudaries of the stomodeum?

Maxillary facial processes

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What happens when the nasal pits appear?

The frontal prominence becomes 3 processes:
-Right and Left lateral nasal facial processes
-Median nasal facial process

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

Right and left lateral nasal facial processes
Median nasal facial process

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Fate of the median nasal facial process

Midline of the nose
Philtrum of the upper lip

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Fate of the lateral nasal processes

Lateral sides and ala of the nose
Infraorbital part of the face

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Fate of the maxillary process

Upper part of the cheeks
Lateral parts of the upper lip

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Fate of the mandibular process

Lower part of the cheeks
Lower lip
Chin

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Fate of Arch II

Becomes an embryonic fold called the Operculum

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Operculum

Covers arches III and IV as well as clefts II, III, IV
Becomes the sides of the neck below the external auditoy meatus

23

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

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

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What is the fate of the Buccopharyngeal membrane

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

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When does formation of the tongue occur?

4th embryonic week

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What stars tongue formation?

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

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What occurs after the buccopharyngeal membrane ruptures?

The 4 lingual swellings merge to form the tongue

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What are the 4 lingual swellings

Tuberculum impar
2 Lateral lingual swellings
Copula

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What becomes the anterior 2/3 of the tongue?

Tuberculum impar and 2 lateral lingual swellings

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What becomes the posterior 1/3 of the tongue?

Copula

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

In the stomodeum

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When does the palate start to form?

5th week

33

What structures enter into formation of the palate

Primary palate
Nasal septum
Palatine folds

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Primary palate

Arises from the inner surface of the medial nasal facial processes

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Nasal septum

Arises from the primary palate

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Palatine folds

Arise form the inner surface of maxillary facial processes
Have lining epithelium that is connected to an underlying mesenchyme

37

How does the palate begin to form?

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.

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What occurs in the 6th embryonic week?

Palatine epithelial fusion

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Palatine epithelial fusion

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