Health Sciences 4320A/B Lecture Notes - Lecture 2: Seminiferous Tubule, Spermiogenesis, Spermatogenesis
15 Jan 2021
School
Department
Course
Professor
Document Summary
Leaves via urethra: urine leaves via the urethra as well and is very acidic, this could kill the sperm, the bulbourethral gland secretes alkaline solution to help neutralize urethra before sperm ejaculates. Spermatogenesis: within seminiferous tubules, produces male gametes, mitosis and meiosis, spermatogonia are true stem cells - one daughter cell differentiates and the. Spermiogenesis: other replaces itself: streamlining process, matures sperm, forms a tail, becomes this process once in the lumen. Time frame of spermatogenesis: engendering - x or y chromosome. Lives in epididymis to mature for 12 days, if not used will be replaced. Spermiogenesis: golgi apparatus packages acrosomal enzymes, position acrosome at anterior end and centrioles at other end, develop microtubules to form flagellum of tail, mitochondrial proliferation and positioning around proximal flagellum, slough off excess cytoplasm, further maturation. Mature sperm: head, tail, nucleus, acrosome, neck, middle piece, principle piece, end piece, this is where fertilization occurs, sperm meets it in here, past the isthmus.
