![]() 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 vasa deferentia, two ducts that pass over and behind the bladder. Sperm are produced in the testicles and stored in the attached epididymides. 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, 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 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, a loose fold of skin that in adults can retract to expose the glans. The proximal parts of the corpus spongiosum form the bulb and the distal ends form the glans penis. The corpus spongiosum is an erectile tissue surrounding the urethra. The crura are the proximal parts of the corpora cavernosa. The corpora cavernosa form most of the penis and contain blood vessels that fill with blood to help make an erection. These columns are surrounded by a fibrous layer of connective tissue called the tunica albuginea. The human penis is made up of three columns of erectile tissue: two corpora cavernosa lie next to each other (separated by a fibrous septum) 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). Shaft: The pendulous part of the penis.It lies within the superficial perineal pouch. Root: It is the attached part, consisting of the bulb in the middle and the crura, one crus on either side of the bulb.Three main parts of the human penis include: Structure Lateral cross section of the penis There are several common body modifications to the penis, including circumcision and piercings. ![]() Neither age nor size of the flaccid penis accurately predicts erectile length. ![]() As of 2015, the average erect human penis is 13.12 cm (5.17 in) long and has a circumference of 11.66 cm (4.59 in). An erect penis may be straight or curved and may point at an upward angle, a downward angle, or straight ahead. In its fully erect state, the shaft becomes rigid and the glans becomes engorged but not rigid. In its flaccid state the penis is smaller, gives to pressure, and the glans is covered by the foreskin. Erections can occur in non-sexual situations spontaneous non-sexual erections frequently occur during adolescence and sleep. It is a passage both for urination and ejaculation of semen.Īn erection is the stiffening expansion and orthogonal reorientation of the penis, which occurs during sexual arousal. The urethra traverses the corpus spongiosum, and its opening, the meatus, lies on the tip of the glans. The human male urethra passes through the prostate gland, where it is joined by the ejaculatory duct, and then through the penis. The body of the penis is made up of three columns of tissue: two corpora cavernosa on the dorsal side and corpus spongiosum between them on the ventral side. The main parts are the root, body, the epithelium of the penis including the shaft skin, and the foreskin covering the glans. In human anatomy, the penis ( / ˈ p iː n ɪ s/ pl.: penises or penes from the Latin pēnis, initially "tail" ) is an external male sex organ ( intromittent organ) that additionally serves as the urinary duct. ![]()
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