Fig. 5.

Mitochondrial reorganization during spermiogenesis. Schematic of spermiogenesis highlighting the formation of the acrosome and the reorganization of mitochondria. During spermatid elongation, a subset of mitochondria line the sperm midpiece, while the rest are transferred into residual bodies for phagocytic degradation in Sertoli cells. It is unknown how the cell determines the fate of these two mitochondrial populations. The acrosome (blue) is another organelle that undergoes drastic reorganization during spermiogenesis.