Brachial apparatus

Question 1

Brachial apparatus

Answer 1

Also called pharyngeal apparatus,

composed of :
clefts,
arches,
pouches.

Question 2

Brachial clefts

Answer 2

Ectoderm derived, also called brachial groove

Question 3

Brachial arches

Answer 3

Mesoderm (muscles and arteries)

NC (bones, cartilage)

Question 4

Brachial pouches

Answer 4

Endoderm derived

Question 5

Mneumotic

Answer 5

CAP covers outside from inside

Cleft = ectoderm
Arches = mesoderm (+NC)
Pouches = endoderm

Question 6

Brachial cleft:

1st cleft

Answer 6

External auditory meatus

Question 7

Brachial cleft:

2nd to 4th cleft

Answer 7

Temporary cervical sinuses,
which are obliterated by proliferation of
2nd arch mesenchyme

Persistent cervical sinuses=brachial cleft cysts within lateral neck