Pharyngeal Arches

Question 1

What are the four parts to the pharyngeal Apparatus?

Answer 1

Arches, grooves, pouches, membrane(we didnt talk about this one)

Question 2

What does our head and neck region look like at the week four stage? and what does it have to do with branchial?

Answer 2

We look like a fish embryo, and the greek word for gill is branchial

Question 3

At week four what is it that causes the pharyngeal arches to start to form?

Answer 3

the migration of neural crest cells to the head and neck region

Question 4

What germ layers make up the arches?

Answer 4

Mesoderm and ectoderm(because of the migration of the neural crest cells) Thats what I have written in my notes, but on the slides it says arches are mesenchyme encased in external ectoderm and interal endoderm.

Question 5

What are the four derivatives of the Arches/

Answer 5

Arteries, skeletal, Muscles, Nerves

Question 6

How many arches are there? and what happens to #5?

Answer 6

There are 6, and 5 degenerates very quickly.

Question 7

What does Arch 1 split up into?

Answer 7

The maxillary and mandibular jaws

Question 8

Nerve for arch 1?

Answer 8

trigeminal 5

Question 9

Nerve for arch 2?

Answer 9

Facial 7

Question 10

Nerve for arch 3?

Answer 10

Glossopharyngeal 9

Question 11

Nerve for arch 4 and 6?

Answer 11

Vagus 10

Question 12

Artery for Arch 1?

Answer 12

maxillary

Question 13

Artery for arch 2?

Answer 13

Stapedial and corticotymapnic

Question 14

Artery for arch 3?

Answer 14

Common carotid and intenral caroitd

Question 15

Artery for arch 4?

Answer 15

Aorta and subclavian

Question 16

Artery for arch 6?

Answer 16

Ductus arteriosus and pulmonary arteries