The cells within the thymus gland probably originated from the _____.

A) spleen
B) liver
C) bone marrow
D) Peyer's patches


Ans: C) bone marrow
In development, leukocytes and erythrocytes begin as stem cells in the yolk sac which then enter the fetus and migrate to blood islands in the bone marrow; some of these cells migrate to and remain in the thymus.

Anatomy & Physiology

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