Quiz 2 practice questions

Question 1

The splanchnopleure:

a. Is the space between dividing the lateral plate mesoderm into two layers.
b. Gives rise to the midgut, foregut and hindgut.
c. Is made of somatic lateral plate mesoderm and ectoderm.
d. Is made of intermediate mesoderm and ectoderm.

Answer 1

b. Gives rise to the midgut, foregut and hindgut.

Question 2

The stomodeum is:

a. Created by the tail fold.
b. A pouch formed by the folding of the yolk sac into the embryo.
c. A depression that will form the way into the gut – the mouth.
d. A landmark left over from the regression of the primitive streak.

Answer 2

c. A depression that will form the way into the gut – the mouth.

Question 3

The somites are directly derived from:

Answer 3

Paraxial mesoderm

Question 4

Listed below are regions of the body plan and how many somites are in that region. Which one is TRUE?

a. 8 occipital
b. 11 thoracic
c. 9 sacral
d. 5 lumbar

Answer 4

d. 5 lumbar

Question 5

The allantois:

a. Is a pocket formed by the proctodeum.
b. Is formed by the tail fold.
c. Is a little pocket of yolk sac that begins caudal to the embryo.
d. Persists in adults as the umbilical artery.

Answer 5

c. Is a little pocket of yolk sac that begins caudal to the embryo.

Question 6

Prior to the head fold:

a. The primordial heart is cranial to the septum transversum.
b. The septum transversum is cranial to the primordial heart.
c. The allantois is created as a “way into” the mouth.
d. The foregut has formed as an inpocketing of mesoderm.

Answer 6

b. The septum transversum is cranial to the primordial heart.

Question 7

Most miscarriages likely happen in the first trimester because:

a. The embryo is over protected during this time.
b. This is the only time major genetic defects are important to development.
c. This is the timing for organogenesis.
d. Most mothers do not know they are pregnant.

Answer 7

c. This is the timing for organogenesis.

Question 8

What is one screening test a mother might receive if her combined screen results in the first trimester are abnormal?

Answer 8

Amniocentesis

Question 9

The basal plate:

a. Gives rise to the leptomeninges.
b. Gives rise to the afferent grey sensory neurons.
c. Gives rise to the white matter.
d. Gives rise to the efferent grey motor neurons.

Answer 9

d. Gives rise to the efferent grey motor neurons.

Question 10

The leptomeninges is derived from ______________ and becomes the _____________ .

Answer 10

Neural crest; arachnoid and pia mater.

Question 11

The prechordal plate:

a. is a thickened area of epiblast cells.
b. organizes the caudal region.
c. is the future site of the mouth.
d. directly touches the cytotrophoblast.

Answer 11

c. is the future site of the mouth.