Penis

Definition

The penis is the male organ used for urination and sexual intercourse. The penis is located above the scrotum. It is made of spongy tissue and blood vessels.

The shaft of the penis surrounds the urethra and is connected to the pubic bone.

The foreskin covers the head (glans) of the penis. The foreskin is removed if the boy is circumcised.

Alternative Names

Information

During puberty, the penis lengthens. The ability to ejaculate begins around 12 to 14 years of age. Ejaculation is the release of sperm-containing fluid from the penis during an orgasm.

Conditions of the penis include:

• Chordee -- downward curve of the penis
• Epispadias -- urethra opening is on the top or side of the penis, rather than the tip
• Hypospadias -- urethra opening is on the underside of the penis, rather than at the tip
• Palmatus or webbed penis -- penis is enclosed by the scrotum
• Peyronie's disease -- a curve during an erection
• Buried penis- penis is hidden by a pad of fat
• Micropenis- penis does not develop and is small

See also:

• Ambiguous genitalia
• Penile prosthesis
• Priapism

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References

Elder JS. Anomalies of the penis and urethra. In: Kliegman RM, Behrman RE, Jenson HB, Stanton BF, eds. Nelson Textbook of Pediatrics. 18th ed. Philadelphia, Pa: Saunders Elsevier; 2007:chap 544.

Brooks JD. Anatomy of the lower urinary tract and male genitalia. In: Wein AJ, ed. Campbell-Walsh Urology. 9th ed. Philadelphia, Pa: Saunders Elsevier; 2007:chap 2.

Jordan GH, Schlossberg SM. Surgery of the penis and urethra. In: Wein AJ, ed. Campbell-Walsh Urology. 9th ed. Philadelphia, Pa: Saunders Elsevier; 2007:chap 33.

Elder JS. Abnormalities of the genitalia in boys and their surgical management. In: Wein AJ, ed. Campbell-Walsh Urology. 9th ed. Philadelphia, Pa: Saunders Elsevier; 2007:chap 126.