3.4 lab - embryology & origin of tissues

Question 1

embryonic erythrocytes in the developing atrium and ventricles my look different from adult blood cells, in what way?

Answer 1

nucleated

Question 2

the embryonic brain and spinal cord do not have a basement membrane, they have…

Answer 2

an external membrane
which is identical in structure to an epithelial basement membrane, but is not basal to anything in particular. thus the different name

Question 3

muscle and fat are separated from adjacent connective tissue by…

Answer 3

an external membrane

Question 4

T/F blood is connective tissue

Answer 4

true

Question 5

T/F ambryonic blood is derived from mesenchymal stem cells

Answer 5

false - hematopoietic stem cells, which are different from mesenchymal stem cells

Question 6

how thick is an endothelial layer between lumen and basement membrane?

Answer 6

one cell thick

Question 7

in the developing loose connective tissue of an embryo, most of the “empty” space is filled with what?

Answer 7

mainly fluid and hydrating proteins

Question 8

in a developing embryo, condensed mesenchymal cells adjacent to the neural tube of the future spinal cord are likely

Answer 8

somites (sclerotome, myotome, and dermatome)

Question 9

mesenchymal cellular condensation to begin forming the somites is triggered by what nearby structure?

Answer 9

the neural ectoderm

Question 10

the single large embryonic blood vessel that will give rise to the future aorta and pulmonary trunk is called the…

Answer 10

truncus arteriosus

Question 11

how is the embryonic esphageal epithelium different from that of the adult?

Answer 11

embryonic esophagus - simple columnar

adult esophagus - stratified squamous