Heath Ledger's Parents: Daughter Matilda is 'Very Much Like Her Dad'. Actor Heath Ledgerâs daughter Matilda, 7, looks an awful lot like her daddy, and his parents agree the two are âvery muchâ alike. In recognition of the fifth anniversary of Heathâs death on Jan. 22, Kim and Sally Ledger sat down with Australiaâs New Idea magazine to talk about their son.
The primitive stem cell of spermatogenesis found on the periphery of each seminiferous tubule is called spermatogonia. Spermatogonia is an undifferentiated male germ cell.
The Testicular Factory. Sperm are produced in the male testicle (testis). The testis is filled with tiny coiled tubes (seminiferous tubules) through which sperm move as they are produced. Each seminiferous tubule is lined with sperm nurse cells (Sertoli cells) and sperm stem cells (Spermatagonia).utside the tube and between the tubes lie testosterone-producing cells (Leydig cells), whose product is essential to regulating sperm production. Hormones produced by the Leydig cell stimulate sperm production indirectly, by acting on the nurse cells, which in turn regulate the sperm cells.