Pharyngeal Apparatus

Question 1

What part of the pharyngeal apparatus does the ectoderm give rise to?

Answer 1

Pharyngeal clefts

Question 2

What part of the pharyngeal apparatus does the mesoderm give rise to?

Answer 2

Arches

Question 3

What part of the pharyngeal apparatus does the endoderm give rise to?

Answer 3

Pouches

Question 4

What is formed by the 1st pharyngeal cleft?

Answer 4

Lining of external ear canal

Question 5

What is formed by the 1st arch?

Answer 5

Muscles of mastication
Maxillary A
CN V (trigeminal nerve)

Question 6

What is formed by the 2nd arch?

Answer 6

Muscles of facial expression
Stapes
CN VII (Facial nerve)

Question 7

What is formed by the 3rd arch?

Answer 7

Stylopharyngeus muscle
CN IX (glossopharyngeal)
Common and internal carotid As

Question 8

What is formed by the 4th arch (only)?

Answer 8

Subclavian A
Aortic arch

Question 9

What is formed by the 6th arch (only)?

Answer 9

Pulmonary A
Ductus arteriosus

Question 10

What is formed by the 4th + 6th arch?

Answer 10

Pharyngeal and laryngeal muscles
CN X (vagus)
Cartilages

Question 11

What is formed by the 1st pouch?

Answer 11

Middle ear

Question 12

What is formed by the 2nd pouch?

Answer 12

Tonsils

Question 13

What is formed by the 3rd pouch?

Answer 13

PTH glands (sup)
Thymus

Question 14

What is formed by the 4th pouch?

Answer 14

PTH (inf)
C cells