spermatogenesis

• Leydig cells secrete testosterone
• it takes place in the seminiferous tubules of the testes
• Head contains acrosome, which contains hydrolytic enzymes which are important in the fertilisation process.
• Midpiece is where mitochondria are located to produce ATP by aerobic respiration.
• Tail allows movement through cervical mucus towards egg cell.
• centrioles in the midpiece aid embryonic division.
• nucleus in the head of sperm for potential DNA and chromosomes.
• spermatogenesis takes place during puberty
• germinal epithelium cells (2n) undergo mitosis which results in spermatogonium (2n). These undergo another round of mitosis resulting in primary spermatocytes (2n).
• Secondary spermatocytes undergo another round of meiosis to form four haploid spermatids
• primary spermatocyte undergoes meiosis 1, resulting in secondary spermatocyte (1n)
• secondary spermatocyte undergoes meiosis 2, resulting in spermatids (1n)
• Spermatids mature into spermatozoa with acrosome, flagellum, nucleus, centriole, and mitochondria.
• Spermatids are immature sperm that have no tails or flagellae
• Spermiogenesis is when spermatids mature into fully functional sperm with tails and flagellae
• Mature sperm are stored in epididymis until ejaculation occurs.