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A testicle or testis (pl. testes) is the gonad in all male bilaterians, including humans, and is homologous to the ovary in females. Its primary functions are the production of sperm and the secretion of androgens, primarily testosterone. The release of testosterone is regulated by luteinizing hormone (LH) from the anterior pituitary gland.
The main male sex organs are the penis and the scrotum, which contains the testicles that produce semen and sperm, which, as part of sexual intercourse, fertilize an ovum in the female's body; the fertilized ovum develops into a fetus, which is later born as an infant. The corresponding system in females is the female reproductive system.
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 ...
The tunica vaginalis is derived from the vaginal process of the peritoneum, which in the fetus precedes the descent of the testes from the abdomen into the scrotum. [7] The vaginal process between the abdominal inguinal ring and the superior part of the testis is then obliterated, usually leaving a string-like or cord-like remnant adjacent to ...
The male external genitalia include the penis and the scrotum. The female external genitalia include the clitoris , the labia , and the vestibule , which are collectively called the vulva . External genitalia vary widely in external appearance among different people.
Section of a testicle of a steer, blood vessels injected with red gelatine. 1 parenchyma, 2 mediastinum testis, 3 tunica albuginea, 4 tail of epididymis, 5 head of epididymis, 6 spermatic cord with convoluted testicular artery
The spermatic cord is the cord-like structure in males formed by the vas deferens (ductus deferens) and surrounding tissue that runs from the deep inguinal ring down to each testicle. Its serosal covering, the tunica vaginalis , is an extension of the peritoneum that passes through the transversalis fascia .
Anatomy photo:36:st-1401 at the SUNY Downstate Medical Center - "Inguinal Region, Scrotum and Testes: Testis" This page was last edited on 13 February 2024, at ...