Corpus Spongiosum, Monkey Penis

The corpus spongiosum is surrounded by a thin tunica albugina (not included in this micrograph). The penile urethra is located in the center of this erectile cylinder. The erectile tissue is made up of trabeculae and cavernous blood spaces. The trabeculae contain smooth muscle and conncetive tissues. The blood spaces are empty when the penis is flacid and filled with blood during erection. Semi-thin section. Corpus spongiosum. Penis. Male Reproductive System. Monkey.