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What (who) is testis - definition
INTERNAL ORGAN USED IN THE MALE REPRODUCTIVE SYSTEM
Testes; Testis; Testicles; Testicular size; Testicular; Testicular diseases; Testicular disorder; Testicular hormones; Teste; Testicals; Testical; Testicular disease; Balls (slang); Orchitic; Testical cyst; Low hangers; Testicle size; Testiculus; Testicular volume; Diseases of the testes
![Male gonad (testes, left) and female gonad ([[ovaries]], right)](https://commons.wikimedia.org/wiki/Special:FilePath/Male and female gonads.svg?width=200 "Male gonad (testes, left) and female gonad ([[ovaries]], right)")
![Animation of the migration of spermatozoa from their origin as germ cells to their exit from the [[vas deferens]]. A) Blood vessels; B) Head of [[epididymis]]; C) Efferent ductules; D) [[Seminiferous tubule]]s; E) Parietal lamina of [[tunica vaginalis]]; F) Visceral lamina of tunica vaginalis; G) Cavity of tunica vaginalis; H) Tunica albuginea; I) Lobule of testis; J) Tail of epididymis; K) Body of epididymis; L) [[Mediastinum testis]]; M) Vas deferens.](https://commons.wikimedia.org/wiki/Special:FilePath/Testis.gif?width=200 "Animation of the migration of spermatozoa from their origin as germ cells to their exit from the [[vas deferens]]. A) Blood vessels; B) Head of [[epididymis]]; C) Efferent ductules; D) [[Seminiferous tubule]]s; E) Parietal lamina of [[tunica vaginalis]]; F) Visceral lamina of tunica vaginalis; G) Cavity of tunica vaginalis; H) Tunica albuginea; I) Lobule of testis; J) Tail of epididymis; K) Body of epididymis; L) [[Mediastinum testis]]; M) Vas deferens.")
![A healthy [[scrotum]] containing normal size testes. The scrotum is in tight condition. The image also shows the texture.](https://commons.wikimedia.org/wiki/Special:FilePath/Human_Scrotum.JPG?width=200 "A healthy [[scrotum]] containing normal size testes. The scrotum is in tight condition. The image also shows the texture.")
Wikipedia
Testicle
A testicle or testis (plural testes) is the male reproductive gland or gonad in all bilaterians, including humans. It is homologous to the female ovary. The functions of the testes are to produce both sperm and androgens, primarily testosterone. Testosterone release is controlled by the anterior pituitary luteinizing hormone, whereas sperm production is controlled both by the anterior pituitary follicle-stimulating hormone and gonadal testosterone.
Examples of use of testis
1. "Bats invest an enormous amount in testis, and the investment has to come from somewhere.
2. More unexpected was the finding that at five years the risk of developing a new tumour in the remaining testis was cut by three–quarters after carboplatin compared with radiation.
3. "We figured it was a pretty good sign, so we decided to take a chance on expanding." Studies in monkeys showed the IVD, which is inserted into the vas deferens – a tube that transports sperm from the testis to the urethra – via a small hole made in the scrotum, was reversible.