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Scrotum Contains testes & epididymis Sustentacular Cells Located in the scrotum Nourish developing sperm Interstitial Cells Produce testosterone Seminal vesicle (Accessory organs) Pair of glands Located inferior & posterior to the bladder Prostate Gland (Accessory Organs) Inferior to Bladder Cowper's Gland (Accessory Organ) "Bulbourethal Gland" Produces pre-ejaculation -Lubricates urethra -Flushes any left over materials Spermatogenesis The process of sperm cell formation spermatozoan "sperm cell/gametes" Head (P.1 Sperm) Contains half of the chromosomes of other cells in the body Acrosome (P.2 Sperm) Protective covering around the head Contains enzymes that can penetrate the wall of egg cells Mid-Piece (P.3 Sperm) Contains mitochondria Tail (P.4 Sperm) Flagellum Parasympathetic Impulses (Erection) Cause: -Vasodilation of arteries -Vasoconstriction of veins Testosterone derived from cholesterol Testosterone Stimulates... Sexual desire Metabolism Develops & Maintains Male Secondary characteristics: Hair distribution Skin thickness Muscle & bone size Larynx enlargement Inhibin Secreted by Steroli Cells in testes Inhibits production of F.S.H Decreases rate of spermatogensis