Embryology Pt 3

Question 0

flexion of embryo

Answer 0

begins at the end of 3rd week, rapid growth causes the embryo to buckle, resulting in a series of folds

Question 1

week 4

Answer 1

flexion of embryo, branchial arches, development of brain.

Question 2

branchial arches

Answer 2

series of transverse elevations and depressions, grow together and meet at midline

Question 3

1st branchial arch

Answer 3

mandibular arch which includes lower lip, muscles of mastication, mandible, anterior portion of the tongue, and some structures of middle ear.

Question 4

2nd branchial arch

Answer 4

hyoid arch which includes: upper body and lesser horns of the hyoid bone, stapes, and muscles of facial expression

Question 5

3rd branchial arch

Answer 5

lower body of the hyoid bone, posterior portion of the tongue.

Question 6

4th and 5th arches

Answer 6

cricoid and arytenoid cartilages of the larynx, cartilages of the trachea

Question 7

6th branchial arch

Answer 7

caudal arch: palatine muscles and pharyngeal constrictor.

Question 8

week four

Answer 8

nasal pits, arm and leg buds, otic pit, umbilical cord.

Question 9

development of brain

Answer 9

prosencephalon, mesencephalon, and rhombencephalon.