While teaching an early pregnancy class, the nurse explains that the morula is a
a. Fertilized ovum before mitosis begins
b. Flattened disc-shaped layer of cells within a fluid-filled sphere
c. Double layer of cells that becomes the placenta
d. Solid ball composed of the first cells formed after fertilization
D
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A The fertilized ovum is called the zygote.
B This is the embryonic disc. It will develop into the baby.
C The placenta is formed from two layers of cells: the trophoblast, which is the
other portion of the fertilized ovum, and the deciduas, which is the portion of the
uterus where implantation occurs.
D The morula is so named because it resembles a mulberry. It is a solid ball of 12
to 16 cells that develops after fertilization.
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