Which type of sperm differentiates to become a primary spermatocyte?

The primary spermatocyte arises from a specific type of stem cell known as Type B spermatogonia. These Type B spermatogonia undergo mitotic division to produce primary spermatocytes. This is a crucial step in spermatogenesis, where the Type B cells commit to a pathway of differentiation that ultimately leads to the formation of sperm cells.

Type A spermatogonia serve a different function; they primarily act as stem cells that replenish the germ cell population. On the other hand, Type C and Type D cells do not directly contribute to the formation of primary spermatocytes. Instead, the differentiation process from spermatogonia to spermatocytes is specifically tied to the Type B lineage, which plays a pivotal role in establishing the first meiotic division stage, setting the stage for subsequent divisions and maturation into sperm.

Thus, recognizing Type B spermatogonia's unique role in the transition to primary spermatocytes is essential for understanding the overall process of spermatogenesis.