laryngeal arch -embryology

Question 1

What structure does the first pharyngeal cleft give rise to in the adult?

Answer 1

The first pharyngeal cleft becomes epithelium and lines the external ear canal.

Question 2

What happens to the fifth pharyngeal arch?

Answer 2

The fifth pharyngeal arch regresses before development is complete.

Question 3

What muscle of the first arch is innervated by the trigeminal nerve?

Answer 3

The tensor tympani muscle is innervated by the trigeminal nerve.

Question 4

What is the nerve of the third arch and what muscle does it innervate?

Answer 4

The glossopharyngeal nerve (CN IX) innervates the stylopharyngeus muscle.

Question 5

From which arch does the stylohyoid ligament develop?

Answer 5

The stylohyoid ligament develops from the 2nd arch.

Question 6

What bone develops from the third arch?

Answer 6

Some textbooks say that part of the hyoid bone develops from the 3rd arch.

Question 7

Which branch of the vagus nerve is the nerve of the sixth pharyngeal arch?

Answer 7

The recurrent laryngeal nerve branch is the nerve of the sixth pharyngeal arch.

Question 8

What does the dorsal third pharyngeal pouch give rise to?

Answer 8

The dorsal third pharyngeal pouch gives rise to the inferior parathyroid glands.