Embryology

Question 1

In which weeks do the pharyngeal pouches develop?

Answer 1

Week 4 and 5

Question 2

What 4 things do all of the pharyngeal arches consist of?

Answer 2

Core of mesenchyme
Neural crest cells
Cranial nerve component
Artery

Question 3

Which cranial nerve innervates arch 1?

Answer 3

Trigeminal nerve

Maxillary and mandibular divisions

Question 4

Which cranial nerve innervates arch 2?

Answer 4

Facial nerve

Question 5

Which cranial nerve innervates arch 3?

Answer 5

Glossopharyngeal nerve

Question 6

Which cranial nerve innervates arch 4?

Answer 6

Vagus nerve, superior laryngeal br.

Question 7

Which cranial nerve innervates arch 6?

Answer 7

Vagus nerve, recurrent laryngeal br.

Question 8

In the first arch what bones come from the dorsal portion?

Answer 8

Maxilla, zygomatic and part of temporal bone

Question 9

In the first arch what bones come from the ventral portion?

Answer 9

Contains Meckel’s cartilage → incus, malleus and mandible

Question 10

What muscles come from arch 1?

Answer 10

Muscles of mastication, anterior belly of digastric, mylohyoid, tensor tympani and tensor palatini
All supplied by V3

Question 11

What skeletal components come from the 2nd arch?

Answer 11

Stapes, styloid process of temporal bone + stylohyoid ligament

Lesser horn and upper part of body of hyoid