Identify the following: Sertoli (sustentacular) cells, Leydig (interstitial cells), Sperm, Seminiferous tubule 1) 2) 3) 4) 1 4 3 1. Which cells make testosterone? Anatomy of the Vagina The vagina extends down from the cervix to the vestibule, which is part of the vulva and the external genitalia. The vagina has three core functions: it carries menstrual flow outside the body, it receives the male penis during sexual intercourse, and it serves as a birth canal during labor. The structures of the vulva include the labia minora and labia majora, the mons pubis, the clitoris, the greater vestibular glands, and the vestibule of the vagina. The vestibule includes two openings: the smaller urethral orifice allows urine to exit (as part of the urinary system). The larger vaginal orifice is the entrance to the vagina. EXTERNAL URETHRAL ORIFICE MONS PUBIS CLITORIS VESTIBULE VAGINAL ORIFICE LABIA MINORA LABIA MAJORA 1. Where does fertilization typically occur? 2. Where does implantation of the embryo occur? Pathology: Ectopic Pregnancy - When implantation occurs outside of the uterus, often in the fallopian tube. Medical application: Tubal ligation - is a type of permanent birth control. The fallopian tubes are cut, tied or blocked to permanently prevent pregnancy. smooth muscle layer of the uterus that produces labor contractions. inner, epithelial layer of the uterus; supplies secretions and blood: 5. 6. shed during menstruation.