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Human penis. In human anatomy, the penis (/ ˈpiːnɪs /; pl.: penises or penes; from the Latin pēnis, initially "tail" [1]) is an external sex organ (intromittent organ) through which males urinate and ejaculate. The main parts are the root, body, the epithelium of the penis including the shaft skin, and the foreskin covering the glans.
The embryonic and prenatal development of the male reproductive system is the process whereby the reproductive organs grow, mature and are established. It begins with a single fertilized egg and culminates 38 weeks later with the birth of a male child. It is a part of the stages of sexual differentiation.
The human genome includes approximately 20,000 protein coding genes: 80% of these genes are expressed in adult testes. [24] The testes have the highest fraction of tissue type-specific genes compared to other organs and tissues. [25] About 1000 of them are highly specific for the testes, [24] and about 2,200 show an elevated pattern of expression.
External genitalia of an adult female (left) and male (right). The human reproductive system includes the male reproductive system, which functions to produce and deposit sperm, and the female reproductive system, which functions to produce egg cells and to protect and nourish the fetus until birth. Humans have a high level of sexual ...
Scrotum. In most terrestrial mammals, the scrotum (pl.: scrotums or scrota; possibly from Latin scortum, meaning "hide" or "skin") [1][2] or scrotal sac is a part of the external male genitalia located at the base of the penis. It consists of a sac of skin containing the external spermatic fascia, testicles, epididymides, and vasa deferentia.
The bulb of penis is the proximal/posterior bulged [1] end of the (unpaired median) corpus spongiosum penis. Together with the two crura (one crus on each side of the bulb), it constitutes the root of the penis. [2] It is covered by the bulbospongiosus. Proximally/posteriorly, the bulb of penis extends towards the perineal body.
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