Pharyngeal arches, pouches and clefts

Question 1

What is the trilaminar disc made of?

Answer 1

Ectoderm- outer later
Mesoderm
Endoderm- inner layer

Question 2

What makes up the pharyngeal apparatus?

Answer 2

Arch, cleft and pouch

Question 3

What are the 6 pharyngeal arches made from

Answer 3

Mesoderm

Question 4

What happens to the 5th pharngeal arch?

Answer 4

doesn’t form or regresses

Question 5

What are the pharyngeal clefts?

Answer 5

made of ectoderm and are between each arch on the outside

Question 6

What are pharyngeal pouches?

Answer 6

Endoderm and between each arch on the inside

Question 7

Pharyngeal arch 1 uses

Answer 7

Chewing
Trigeminal nerve
Maxilla and mandible, incus and malleus, temporal and zygomatic bones, temporals, pterygoid, masseter

Question 8

Pharyngeal arch 2 uses

Answer 8

facial nerve

hyoid bone, styloid process, stapes, muscles of facial expression

Question 9

pharyngeal arch 3 uses

Answer 9

glossopharyngeal nerve Hyoid bone and stylopharyngess

Question 10

4th and 6th arch

Answer 10

vagus nerve
Superior laryngeal and recurrent laryngeal and laryngeal cartilages
pharyngeal constrictors and cricothyroid muscles
6th- intrinsic muscles of larynx

Question 11

Tongue is made from arches:

Answer 11

1, 3 and 4

Question 12

what does Pharyngeal clefts 2-4 do?

Answer 12

fade as embryo grows

Question 13

What does pharyngeal cleft 1 do?

Answer 13

helps form the ear, ear canal and ear drum

Question 14

What does the 1st pharyngeal pouch form?

Answer 14

internal auditory meatus and eustachian tube

Question 15

What does 2nd pouch form

Answer 15

primitive tonsils

Question 16

What does 3rd pouch form

Answer 16

inferior parathyroid and

thymus

Question 17

What does 4th pouch form

Answer 17

superior parathyroid

parafollicular cells of thyroid

Question 18

What does the thyroid gland form from?

Answer 18

endoderm at base of tongue and parathyroid cgland and cell latch on