KINS 1222 Study Guide - Final Guide: Seminiferous Tubule, Tunica Vaginalis, Abdominopelvic Cavity
24 May 2019
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Male reproductive system - purpose is to produce sperm: primary sex organs vs. accessory reproductive organs, primary sex organs (gonads) Secrete steroid sex hormones: accessory reproductive organs. Fallopian tubes delivering eggs: scrotum - houses the testes, sac of skin and abdominopelvic cavity. Contains paired testes: 3 c lower than the core body temperature, dartos & cremaster muscles. These work together so they can either move away from the body if too hot or towards the body if too cold. Septa divides testes into ~250 lobules, each containing 1-4 seminiferous tubules: site of sperm production. Form blood-testis barrier: germ cells (sex cells) Leydig cells -> located between seminiferous tubules in the testes: prompts spermatogenesis, targets all accessory organs, has multiple anabolic effects throughout the body, deficiency leads to atrophy; semen volume declines; erection and ejaculation impaired (treated with testosterone replacement) Site of sperm production: spermatogenesis, begins after puberty and constantly continues from there (not at birth, mitosis gives rise to sperm.
