![]() ![]() The human penis differs from those of most other mammals, as it has no baculum (or erectile bone) and instead relies entirely on engorgement with blood to reach its erect state. The penile raphe is the visible ridge between the lateral halves of the penis, found on the ventral or underside of the penis, running from the meatus (opening of the urethra) and continuing as the perineal raphe across the scrotum and the perineum (area between scrotum and anus). The prostate as well as the bulbourethral glands add further secretions, and the semen is expelled through the penis. Fluids are added by the seminal vesicles and the vas deferens turns into the ejaculatory ducts, which join the urethra inside the prostate gland. During ejaculation, sperm are propelled up the vas deferens, two ducts that pass over and behind the bladder. Sperm are produced in the testes and stored in the attached epididymis. It is a passage both for urine and for the ejaculation of semen. The urethra, which is the last part of the urinary tract, traverses the corpus spongiosum, and its opening, known as the meatus / m iː ˈ eɪ t ə s/, lies on the tip of the glans penis. The penile raphe is the noticeable line along the underside of the penis. The rounded base of the glans is called the corona. The area on the underside of the penis, where the foreskin is attached, is called the frenum, or frenulum. The enlarged and bulbous-shaped end of the corpus spongiosum forms the glans penis with two specific types of sinusoids, which supports the foreskin, or prepuce, a loose fold of skin that in adults can retract to expose the glans. The proximal parts of the corpus spongiosum form the bulb of penis and the distal ends form the glans penis. The corpus spongiosum is an erectile tissue surrounding the urethra. The crus of penis is the proximal parts of the corpora cavernosum. The corpus cavernosum forms most of the penis and contains blood vessels that fill with blood to help make an erection. The human penis is made up of three columns of tissue: two corpora cavernosa lie next to each other on the dorsal side and one corpus spongiosum lies between them on the ventral side. The epithelium is not attached to the underlying shaft so it is free to glide to and fro. Epithelium of the penis consists of the shaft skin, the foreskin, and the preputial mucosa on the inside of the foreskin and covering the glans penis.The base of the body of penis is supported by the suspensory ligament which is attached to the pubic symphysis. The ventral surface is marked by the penile raphe. ![]() It has two surfaces: dorsal (posterosuperior in the erect penis), and ventral or urethral (facing downwards and backwards in the flaccid penis).
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