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.
All of these cells are generated from a single, totipotent cellâthe zygote, or fertilized egg. Most scientists use the term pluripotent to describe stem cells that can give rise to cells derived from all three embryonic germ layersâ mesoderm, endoderm, and ectoderm.These three germ layers are the embryonic source of all cells of the body (see Figure 1.1. Differentiation of Human Tissues).All of the many different kinds of specialized cells that make up the body are derived from one of these germ layers (see Table 1.1.ll of these cells are generated from a single, totipotent cellâthe zygote, or fertilized egg. Most scientists use the term pluripotent to describe stem cells that can give rise to cells derived from all three embryonic germ layersâ mesoderm, endoderm, and ectoderm.