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Maximum Power XL Organs of the Male Reproductive System In the male reproductive system, internal and external structures are distinguished: External structures of the male reproductive system Penis The penis is the male sexual organ that includes 3 parts: The root, which adheres to the wall of the abdomen The body is cylindrical and consists of three internal chambers, two chambers are called corpora cavernosa and are filled with spongy tissue. The spongy tissue contains smooth muscles, fibrous tissues, spaces, veins and arteries. These spaces fill with blood when the man is sexually aroused. The cavernous bodies are surrounded by a membrane called tunica albuginea. As the penis fills with blood, it becomes rigid and erect, allowing penetration into the sexual relationship. The skin of the penis is loose and elastic to adapt to changes in the size of the penis during erection. The urethra, is the channel to urinate and ejaculate, occupies the length below the corpora cavernosa The glans is located at the end of the shaft and is where the opening of the urethra is located The penis also contains a series of sensitive nerve endings. The semen contains the sperm and ejaculated through the tip of the penis when the man