Primary cell from which sperms are derived is (PGI – 2009)
Pg. 27, Langman embryology (Ed 11th)
A spermatogonium (plural: spermatogonia) is an intermediary male gametogonium (a kind of germ cell) in the production of spermatozoa. They are themselves derived from primordial germ cells.
These germ cells can be divided into Type A, In (intermediate), and Type B Spermatogonia. Included in the Type Aspermatogonia are a subset of cells from which all germ cells are derived; the spermatogonial stem cells.
Spermatogonia are the primitive differentiated male germ cells which give rise to primary spermatocytes, through the first meiotic division.
Primary spermatocytes are diploid cells which divide by meiosis to produce secondary spermatocytes (haploid).
Secondary spermatocytes undergo a second round of meiosis to produce the haploid round spermatids and finally mature sperms.