spermatogonium, showing chromatin element (x) associated with a nucleolus (n).
spermatogonium sper·mat·o·go·ni·um (spər-māt'ə-gō'nē-əm, spûr'mə-tə-)
n. pl. sper·mat·o·go·ni·a (-nē-ə)
Any of the cells of the gonads in male organisms that are the progenitors of spermatocytes. Also called spermatoblast.
Any of the cells of the gonads in male organisms that undergo mitosis to form spermatocytes as well as new spermatogonia. See more at spermatogenesis.