Formation of the Face, Tongue, and Oral Caviy

Question 1

Formation definition

Answer 1

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

Question 2

Growth definition

Answer 2

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

Question 3

Development definition

Answer 3

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

Question 4

When does the formation of the face occur?

Answer 4

Weeks 3-5

Question 5

What occurs during the third embryonic week?

Answer 5

The Stomodeum appears

Crown to rump measurment is 3mm

Question 6

Stomodeum

Answer 6

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

Question 7

Boundaries of the Stomodeum

Answer 7

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

Question 8

What happens in the 4th embryonic week?

Answer 8

Branchial arches and clefts appear (and disappear)

Question 9

Arch I

Answer 9

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

Question 10

Comissura laborium oris derives from…

Answer 10

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

Question 11

Brachial cleft I becomes…

Answer 11

External acoustic meatus

Question 12

Brancial cleft II becomes…

Answer 12

Eustachian tube

Question 13

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

Answer 13

Right and Left mandibular facial processes

Question 14

What becomes the posterolateral boudaries of the stomodeum?

Answer 14

Maxillary facial processes

Question 15

What happens when the nasal pits appear?

Answer 15

The frontal prominence becomes 3 processes:

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

Question 16

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

Answer 16

Right and left lateral nasal facial processes

Median nasal facial process

Question 17

Fate of the median nasal facial process

Answer 17

Midline of the nose

Philtrum of the upper lip

Question 18

Fate of the lateral nasal processes

Answer 18

Lateral sides and ala of the nose

Infraorbital part of the face

Question 19

Fate of the maxillary process

Answer 19

Upper part of the cheeks

Lateral parts of the upper lip

Question 20

Fate of the mandibular process

Answer 20

Lower part of the cheeks
Lower lip
Chin

Question 21

Fate of Arch II

Answer 21

Becomes an embryonic fold called the Operculum

Question 22

Operculum

Answer 22

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

Becomes the sides of the neck below the external auditoy meatus

Question 23

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

Answer 23

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

Question 24

What is the fate of the Buccopharyngeal membrane

Answer 24

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

Question 25

When does formation of the tongue occur?

Answer 25

4th embryonic week

Question 26

What stars tongue formation?

Answer 26

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

Question 27

What occurs after the buccopharyngeal membrane ruptures?

Answer 27

The 4 lingual swellings merge to form the tongue

Question 28

What are the 4 lingual swellings

Answer 28

Tuberculum impar 2 Lateral lingual swellings Copula

Question 29

What becomes the anterior 2/3 of the tongue?

Answer 29

Tuberculum impar and 2 lateral lingual swellings

Question 30

What becomes the posterior 1/3 of the tongue?

Answer 30

Copula

Question 31

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

Answer 31

In the stomodeum

Question 32

When does the palate start to form?

Answer 32

5th week

Question 33

What structures enter into formation of the palate

Answer 33

Primary palate Nasal septum Palatine folds

Question 34

Primary palate

Answer 34

Arises from the inner surface of the medial nasal facial processes

Question 35

Nasal septum

Answer 35

Arises from the primary palate

Question 36

Palatine folds

Answer 36

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

Question 37

How does the palate begin to form?

Answer 37

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.

Question 38

What occurs in the 6th embryonic week?

Answer 38

Palatine epithelial fusion

Question 39

Palatine epithelial fusion

Answer 39

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