Embryology

Question 1

What does the first pharyngeal pouch become?

Answer 1

The middle ear chamber

Question 2

The first pharyngeal arch is called?

Answer 2

The mandibular arch

Question 3

What does the first arch contain?

Answer 3

Meckel’s cartilage, cranial nerve V (trigeminal), aortic arch

Question 4

The first pharyngeal cleft is called the?

Answer 4

Hyomandibular

Question 5

The first pharyngeal cleft becomes?

Answer 5

The external ear canal

Question 6

The second pharyngeal arch is called the?

Answer 6

Hyoid arch

Question 7

What does the second arch contain?

Answer 7

Reichart’s cartilage and CN VII, the facial nerve

Question 8

How many facial processes are there and what are they?

Answer 8

5

Frontonasal prominence, two maxillary and two mandibular prominences

Question 9

What does the frontonasal process divide into?

Answer 9

The mesial and lateral nasal processes

Question 10

How many pharyngeal arches are there? Which one is transient?

Answer 10

6, the 5th one is transient

Question 11

In what week of development do the mesial and lateral processes form?

Answer 11

the 5th week

Question 12

The medial and lateral nasal processes are responsible for forming what?

Answer 12

Lip, nose, and pre-maxilla or anterior maxilla

Question 13

What nasal prominences are important for lip development?

Answer 13

The medial, if they don’t fuse at the midline a cleft lip can form

Question 14

What happens if the medial nasal prominence does fuse with the maxillary prominence?

Answer 14

Lateral cleft lip

Question 15

The frontonasal process surrounds?

Answer 15

The forebrain

Question 16

When does the primary palate or pre-maxilla form?

Answer 16

Between the 4th and 7th weeks of development

Question 17

When the maxillary process and medial nasal prominence fuse they form what structures?

Answer 17

The lip, philtrum, 4 central incisors, palatal component or triangular palate

Question 18

When does the secondary palate form?

Answer 18

Between the 6th and 9th weeks

Question 19

What does a unilateral cleft lip result in as far as teeth?

Answer 19

Missing, deformed, or supernumerary lateral

Question 20

The frontonasal prominence forms?

Answer 20

Forehead and dorsum apex of the nose

Question 21

The lateral nasal prominences form?

Answer 21

The ala of the nose

Question 22

The medial nasal prominences form?

Answer 22

Septum and philtrum

Question 23

The maxillary prominence forms?

Answer 23

Upper cheek region and upper lip

Question 24

The mandibular prominences form?

Answer 24

Chin, lower lip, lower cheek

Question 25

The third arch forms?

Answer 25

The hyoid bone and CN IX, glossopharyngeal nerve

Question 26

The fourth arch forms?

Answer 26

Thyroid cartilage and CN X

Question 27

When do the processes that form the face develop?

Answer 27

4th week in utero

Question 28

The 6th arch forms?

Answer 28

Cricoid cartilage, vagus, MM of larynx

Question 29

When does the upper lip form?

Answer 29

4-6 weeks

Question 30

When does the 1st arch form?

Answer 30

6 weeks

Question 31

Nasal placodes form when? When do the nasal pits fuse?

Answer 31

4-5 weeks and 7 weeks respectively

Question 32

At what age is body growth complete?

Answer 32

20 years