Testis

The male gonad that produces spermatozoa and testosterone (pi. testes, testicles).


One of two male sex glands in the scrotum.


Testes, either of a pair of male gonads, or sex glands, that produces sperm and secretes androgens. The adult testes, each about 1½ inches (4 centimeters) long and oval-shaped, are suspended in the scrotum below the abdomen. Each testis consists of many hundred seminiferous tubules where sperm develop. The sperm pass from there through efferent ducts to the epididymis, after which they pass into the vas deferens for movement toward the penis.


Either of the pair of male sex organs that produce spermatozoa and secrete the male sex hormone androgen under the control of gonadotropins from the pituitary gland. The testes of the fetus form within the abdomen but descend into the scrotum in order to maintain a lower temperature that favors the production and storage of spermatozoa. The bulk of the testis is made up of long convoluted seminiferous tubules, in which the spermatozoa develop. The tubules also contain Sertoli cells, which may nourish developing sperm cells. Spermatozoa pass from the testis to the epididymis to complete their development. The interstitial (Leydig) cells, between the tubules, are the major producers of androgen.


The male gonad; testicle. It is one of two reproductive glands located in the scrotum that produce the male reproductive cells (spermatozoa) and the male hormones testosterone and inhibin.


The male reproductive organ that makes sperm and testosterone.


One of the two male reproductive organs, known as testicles, serves the dual function of generating sperm and producing the hormone testosterone. During the initial stages of fetal development, the testes develop within the abdomen. Triggered by hormones from both the mother and the fetus, the testes gradually descend over time. By the time of birth or shortly thereafter, they typically descend to the body’s surface and are positioned within a pouch of skin known as the scrotum.


Enclosed within each testicle are the seminiferous tubules, intricate coiled structures responsible for the production of sperm. These tubules are connected to the epididymis through small ducts known as vasa efferentia. The epididymis, situated behind the testicle, is where the recently developed sperm undergo maturation. Between the seminiferous tubules, certain cells generate testosterone, the primary male sex hormone. This testosterone is then transported into the bloodstream through small blood vessels within the testicle, eventually entering circulation throughout the body.


A resilient and fibrous covering called the tunica albuginea shields each testicle, while the spermatic cord suspends it from the body. This cord is comprised of the vas deferens, which is responsible for conveying sperm from the epididymis to the urethra, along with various blood vessels and nerves.


A testicle, one of the two male reproductive glands responsible for producing semen.


 


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