what is the site of precussor cell at this stage of fetal
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Large and small pre-B cells were present in the liver and bone marrow. ... It can be concluded from these data that during early human fetal life the liver is an important site of pre-B cell production. From 12 weeks onwards, this function is gradually taken over by the bone marrow.
Explanation:
The inner cell mass will give rise to the pre-embryo, the amnion, yolk sac and allantois, while the fetal part of the placenta will form from the outer trophoblast layer. The embryo plus its membranes is called the conceptus, and by this stage the conceptus has reached the uterus.
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