Embryology Sequence

Question 1

The primitive oral cavity or stomodeum appears as a pit or invagination of tissue underlying the forebrain.

Answer 1

Late in the 3rd prenatal week

Question 2

all face and all parts of the oral and nasal cavities developed from the frontal process and 1st branchial arch (Mandibular arch)

Answer 2

4th week

Question 3

After establishment of the stomodeum, frontal process and branchial arches, the maxillary processes appear as small buds at the ends of the first branchial arch

Answer 3

4th week

Question 4

Around the centrally located oral pit are grouped the frontal, maxillary, and mandibular arch. ALTHOUGH APPEARING UNRELATED THIS TIME, these processes and first arch from the human face.

Answer 4

4th week

Question 5

These buds grow upward and medially at the left and right sides of the stomodeum

Answer 5

4th week

Question 6

Above the stomodeum is the frontal process; below it is the 1st branchial arch

Answer 6

4th week

Question 7

Frontal prominence forms the stomodeum

Answer 7

4th week

Question 8

Nasal pit develop & appear on the sides of the face.

Answer 8

5th week

Question 9

Frontal process become FRONTONASAL

Answer 9

5th week

Question 10

After the maxillary processes have formed, a pair of depressions (olfactory pits) appear on the lower border of the frontal process.

Answer 10

5th week

Question 11

The enlarged maxillary process is near contact with the medial nasal process.

Answer 11

6th week

Question 12

NASAL PITS APPEAR MORE CENTRALLY LOCATED IN THE MEDIAL NASAL PROCESS. THIS IS THE RESULT OF GROWTH OF THE LATERAL FACE, WHICH ALSO CAUSES THE EYES TO APPROACH THE FRONT OF THE FACE

Answer 12

6th week

Question 13

Auricular hillocks bordering the ear canal have emerged.

Answer 13

6th week

Question 14

Lateral parts of the face expand, broadening the face which is caused by the lateral growth of the brain.

Answer 14

6th week

Question 15

The lack of fusion of the medial nasal and maxillary processes results in cleft lips.

Answer 15

6th week

Question 16

THE MEDIAL NASAL AND MAXILLARY PROCESSES HAVE MERGED.

Answer 16

7th week

Question 17

THE EYES ARE CLOSER TO THE FRONT OF THE FACE. THE NOSE AND EYES ARE ON THE SAME HORIZONTAL PLANE, WHICH WILL CHANGE WITH VERTICAL GROWTH OF THE FACE. THE AURICLES OF THE EAR HAVE DEVELOPED.

Answer 17

7th week

Question 18

Become more human-like appearance.

Answer 18

7th week

Question 19

The upper lip has producing the philtrum.

Answer 19

7th week

Question 20

The Auricular hillocks are fused together to form the ears.

Answer 20

7th week

Question 21

The maxilla develops from the center of ossification (cartilage of nasal capsule) in the mesenchyme of the maxillary process of the 1st branchial arch.

Answer 21

8th week