Size of Uterus Throughout Pregnancy: The uterus expands dramatically during pregnancy, growing from a small pelvic organ to a structure that can reach the rib cage to accommodate fetal development.
Sexual Differentiation: Sexual differentiation begins with genetic sex (XX or XY), then proceeds under hormonal influence, with testes producing testosterone that drives male development and its absence allowing female structures to develop.
Male Urethra: The male urethra is a dual-purpose tube that conveys urine and semen; it passes through the prostate, urogenital diaphragm, and penis in prostatic, membranous, and spongy sections.
