This penultimate lecture concludes the discussion of the male reproductive system. Here Professor Diamond introduces the sex glands, which include the seminal vesicles, prostate and the balbo urethra glades, detailing their location, functions and secretions. These secretions include acid phosphate from the prostate, which is used to detect prostate cancer. She then turns to the penis, diagramming its components, location of glands, purpose of circumcision, and finally its functions. She also talks about erection and ejaculation, as well as birth control methods including cutting the vas deferens (vasectomy). Professor Diamond then moves on to the integumentary system, the organ of skin, and also the largest organ in the body. Of particular interest is that hair and brain cells arise from the same embryonic stem cells. She covers in detail the constituents (skin, hair, nails, glands), function, and the structure of skin. She concludes with a slide of skin cells and notes that the next lecture will cover skin cancer.