Embryology Pt 2

Question 0

primitive streak

Answer 0

establishes a structural foundation for change along the longitudinal axis

Question 1

week three

Answer 1

embryo begins to change from a round disk shape to a long tube or pear shape

Question 2

hensen’s node

Answer 2

small area of proliferating cells

Question 3

neural plate

Answer 3

thickening that grows upward to form the neural folds, and will give rise to all of the neurons and neuroglial cells.

Question 4

notochord

Answer 4

strip of cells along the midline of the neural plate; primitive axial skeleton.

Question 5

neural folds

Answer 5

thickening along the lateral margins of the neural plate; they meet and fuse in the midline to form a tube

Question 6

neural tube

Answer 6

formed where the neural folds meet at the midline and fuse; gives rise to the entire cns.

Question 7

neural crest

Answer 7

ridge of ectodermal cells on either side of the neural tube; becomes the spinal and cranial nerve ganglia

Question 8

somites

Answer 8

blocks of tissue; differentiates into three groups: sclerotome, myotome, and dermotome.

Question 9

sclerotome

Answer 9

innermost part of the somite, becomes individual vertebrae, intervertebral discs, and ribs

Question 10

myotome

Answer 10

lateral to sclerotome, becomes musculature of the trunk.

Question 11

dermatome

Answer 11

most lateral portion of a somite, becomes the dermis.