Question 1

Which paired processes fuse to form the intermaxillary segment internally within the embryo during prenatal development?

Accepted Answer

The intermaxillary segment arises as a result of fusion of the two medial nasal processes internally within the embryo.

Question 2

When is the palate formed during prenatal development?

Accepted Answer

The formation of the palate starts during the fifth week of prenatal development,within the embryonic period.The palate is then completed later during the twelfth week,within the fetal period.

Question 3

The _____ is a superficial demarcation of the line of fusion of the two lateral lingual swellings during tongue development,as well as that of a deeper fibrous structure.

Accepted Answer

The median lingual sulcus is a superficial demarcation of the line of fusion of the two lateral lingual swellings,as well as that of a deeper fibrous structure.

Question 4

When does tongue development occur during prenatal development?

Accepted Answer

The tongue develops during the fourth to eighth week of prenatal development.

Question 5

The tongue develops from multiple swellings derived from the:

Accepted Answer

The body of the tongue develops from the first branchial arch,and the base of the tongue originates later from the second,third,and fourth branchial arches.

Question 6

During which week of prenatal development is the palate completed?

Accepted Answer

When the three processes completely fuse,they form the final palate,including the hard and soft palate,during the twelfth week of prenatal development.

Question 7

Which of the following statements concerning tongue disturbances is correct?

Accepted Answer

Abnormalities of the tongue are uncommon.However,one type that is more common than others is ankyloglossia,which results from a short attachment of the lingual frenum that extends to the tongue apex.It may be associated with other craniofacial abnormalities.However,if it has not adjusted over time and movement is still not functional,orofacial myofunctional therapy may be attempted before surgically cutting the lingual frenum is considered.

Question 8

Considering the developmental disturbance of cleft palate,which of the following statements is correct?

Accepted Answer

Cleft lip may also be isolated or associated with other abnormalities,such as cleft lip.Isolated forms of cleft palate are less common than cleft lip and are more common in females,unlike cleft lip,which is more common in males.Cleft uvula is the least complicated example of cleft palate.

Question 9

During tongue development,what does the epiglottic swelling develop from?

Accepted Answer

The epiglottic swelling develops from the mesenchyme of the posterior parts of the fourth branchial arches,which is even farther posterior to the copula,and is the projection of a third median swelling.This swelling marks the development of the most posterior region of the tongue and the site of the future epiglottis.

Question 10

Which of the following statements concerning tongue development is correct?

Accepted Answer

Tongue development begins as a triangular median swelling,the tuberculum impar.The copula is formed from the fusion of mesenchyme of mainly the third and parts of the fourth branchial arches.The foramen cecum is the beginning of the thyroglossal duct.The tongue develops during the fourth to eighth week of prenatal development.

Question 11

The fusion of the two palatal shelves with the primary palate is dependent on the:

Accepted Answer

As the developing tongue muscles begin to function,the tongue contracts and moves out of the way of these developing palatal shelves; thus,the tongue avoids being an obstacle to the future fusion of the shelves by moving both anteriorly and inferiorly.

Question 12

As the tongue develops still further,the copula of the tongue base,after overgrowing the second branchial arch,merges with the anterior swellings of the first branchial arch of the tongue body,with the fusion is superficially demarcated by the:

Accepted Answer

As the tongue develops still further,the copula of the tongue base,after overgrowing the second branchial arch,merges with the anterior swellings of the first branchial arch of the tongue body during the eighth week of prenatal development.This fusion is superficially demarcated by the sulcus terminalis in the mature dorsal surface of the tongue,an inverted V-shaped groove marking the border between the base of the tongue and its body.

Question 13

Which of the following statements concerning palatal developmental is correct?

Accepted Answer

Palatal fusion allows swellings or tissue from different surfaces of the embryo to meet and join,similar to that of the fusion of the neural tube and upper lip.The intermaxillary segment gives rise to the primary palate.The nasal cavity forms at the same time as the palate.The secondary palate gives rise to the posterior two thirds of the hard palate.

Question 14

The intermaxillary segment is an internal wedge-shaped mass that extends inferiorly and deep to the nasal pits on the:

Accepted Answer

The intermaxillary segment is an internal wedge-shaped mass that extends inferiorly and deep to the nasal pits on the inside of the stomodeum.

Question 15

What part of the final palate does the secondary palate give rise to?

Accepted Answer

The secondary palate gives rise to the posterior two thirds of the hard palate,which contains certain anterior maxillary teeth (canines) and posterior teeth,posterior to the incisive foramen; it also gives rise to the soft palate and its uvula.

Question 16

Which of the following structures is initially formed during the fifth week of prenatal development?

Accepted Answer

During the fifth week of prenatal development and still within the embryonic period,the intermaxillary segment forms.The intermaxillary segment arises as a result of fusion of the two medial nasal processes internally within the embryo.

Question 17

Which teeth are associated with the further development of the primary palate?

Accepted Answer

In the future,the primary palate will form the premaxillary part of the maxilla,which is the anterior one third of the hard palate.This small part of the hard palate is anterior to the incisive foramen and will contain the maxillary incisors.The secondary palate will give rise to the posterior two thirds of the hard palate,which contains certain anterior maxillary teeth,the canines,as well as the maxillary posterior teeth.

Question 18

The small paired nasopalatine canals are represented in the mature hard palate by the:

Accepted Answer

The small paired nasopalatine canals persist near the median plane of the mature palate at the site of the junction of the primary palate and the secondary palate.These canals are represented in the mature hard palate by the incisive foramen beneath the incisive papilla.

Question 19

During the sixth week of prenatal development,within the embryonic period,the bilateral maxillary processes give rise to paired:

Accepted Answer

During the sixth week of prenatal development,within the embryonic period,the bilateral maxillary processes give rise to paired palatal shelves.

Question 20

What structure partially separates the nasal and oral cavities in the fifth week of prenatal development?

Accepted Answer

The intermaxillary segment also gives rise to the primary palate,which at this time serves only as a partial separation between the developing oral cavity proper and nasal cavity.

Quiz 5: Orofacial Development