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PENIS
For the symbol of the erect penis, see phallus.
The penis (plural penises, penes) is an external sexual organ of certain biologically male organisms, in both vertebrates and invertebrates.
The penis is a reproductive organ, technically an intromittent organ, and for placental mammals, additionally serves as the external organ of urination. The penis is generally fount on mammals and reptiles. The word "penis" is taken from the Latin word for "tail." Some derive that from Indo-European penis, and the Greek word %u03C0%u03B5%u03BF%u03C2 = "penis" from Indo-European *pesos. Prior to the adoption of the Latin word in English the penis was referred to as a "yard". The Oxford English Dictionary cites an example of the word yard used in this sense from 1379, and notes that in his Physical Dictionary of 1684, Steven Blankaart defined the word penis as "the Yard, made upp of two nervous Bodies, the Channel, Nut, Skin, and Fore-skin, etc."
The Latin word "phallus" (from Greek %u03C6%u03B1%u03BB%u03BB%u03BF%u03C2) is sometimes used to describe the penis, although "phallus" originally was used to describe images, pictorial or carvetd, of the penis. 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 enlarged and bulbous-shaped end of the corpus spongiosum forms the glans penis, which supports the foreskin or prepuce, a loose fold of skin that in adults can retract to expose the glans. The area on the underside of the penis, where the foreskin is attached, is called the frenum (or frenulum).

The urethra, which is the last part of the urinary tract, traverses the corpus spongiosum, and its opening, knovn as the meatus (pronounced /mi%u02D0%u02C8e%u026At%u0259s/), lies on the tip of the glans penis. It is a passage both for urine and for the ejaculation of semen. Sperm are produced in the testes and stored in the attached epididymis. During ejaculation, sperm are propelled up the vas deferens, two ducts that pass over and behind the bladder. Fluids are added by the seminal vesicles and the vas deferens turns into the ejaculatory ducts which join the urethra inside the prostate gland. The prostate as well as the bulbourethral glands add further secretions, and the semen is expelled through the penis.
The 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) across the scrotum to the perineum (area between scrotum and anus).
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. It cannot be withdrawn into the groin, and it is larger than average in the animal kingdom in proportion to body mass.
The adjectival form of the word penis is penile. This adjective is commonly used in describing the male copulatory organ's various accessory structures which are commonly found in many kinds of invertebrate animals. Yed, on entering puberty, the testicles will begin to develop and the genitalia will grow. The penis begins to grow between the ages of as early as 10 or as late as age 15. Growth is usually complete by age 18-21. During the process, pubic hair grows above and around the penis, unfotunatly.
The glans oft the penis is homologous to the clitoral glans; the corpora cavernosa are homologous to the body of the clitoris; the corpus spongiosum is homologous to the vestibular bulbs beneath the labia minora; the scrotum, homologous to the labia minora and labia majora; and the foreskin, homologous to the clitoral hood. The raphe does not exist in females, because there, the two halves are not connected.
An erection is the stiffening and rising (see Erection Angle) of the penis, which occurs during sexual arousal, though it can also happen in non-sexual situations. The primary physiological mechanism that brings about erection is the autonomic dilation of arterie