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 [tes´tēz] (L.)
plural of testis.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.


Plural of testis.
Farlex Partner Medical Dictionary © Farlex 2012


Plural of testis.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.


Plural of testis.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012


(tes'tis) plural.testes [L.]
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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. See: illustration


Each is an ovoid body about 4 cm long and 2 to 2.5 cm in width and thickness, enclosed within a dense inelastic fibrous tunica albuginea. The testis is divided into numerous lobules separated by septa, each lobule containing one to three seminiferous tubules within which the spermatozoa are produced by meiosis. The lobules lead to straight ducts that join a plexus, the rete testis, from which 15 to 20 efferent ducts lead to the epididymis. The epididymis leads to the ductus deferens, through which sperm are conveyed to the urethra. Between the seminiferous tubules are the interstitial cells (cells of Leydig), which secrete testosterone. Within the tubules are sustentacular cells, which secrete inhibin. The testes are suspended from the body by the spermatic cord, a structure that extends from the inguinal ring to the testis and contains the ductus deferens, testicular vessels (spermatic artery, vein, lymph vessels), and nerves.


Hyperfunction (hypergonadism) may cause early maturity such as large sexual organs with early functional activity and increased growth of hair. Hypofunction (hypogonadism) is indicated by undeveloped testes, absence of body hair, high-pitched voice, sterility, smooth skin, loss of sexual desire, low metabolism, and eunuchoid or eunuch body type.

descent of testis

The migration of the testis from the abdominal cavity to the scrotum during fetal development.

displaced testis

A testis located abnormally within the inguinal canal or pelvis.

femoral testis

An inguinal testis near or superior to the femoral ring.

inverted testis

A testis reversed in the scrotum so that the epididymis attaches to the anterior instead of the posterior part of the gland.

perineal testis

A testis located in the perineal region outside the scrotum.

undescended testis

Medical Dictionary, © 2009 Farlex and Partners


The pair of male reproductive glands enclosed in the scrotum that produce the male sex hormone testosterone and the spermatozoa. The singular form is testis.
Gale Encyclopedia of Medicine. Copyright 2008 The Gale Group, Inc. All rights reserved.

Patient discussion about testes

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References in periodicals archive ?
The photographs of the testes were captured by using a digital camera (Samsung ES95, 16.2 megapixel.
This term refers to unilateral herniation of both testes and a part of the Mullerian structures through the processus vaginalis.
stated that the capacity of sperm production is similar between testes of Japanese quails despite the difference in morphology, since sperm production is directly related to testicular weight which is contrary to the reports of Obidi et al.
The testes of men without azoospermia have small amounts of bacteria belonging to four main groups, the scientists found.
(1) To determine the sensitivity and specificity of laparoscopy in localizing nonpalpable testes
The mean diameter of seminiferous tubules of testes was 218.26 +- 7.45um in group A, 123.96+-11.84 in group B and 180.86+-12.13 in group C (p<0.001).
Conclusion: The results of this study revealed that CBO has protective effect against the toxic effects in rat testes induced by cadmium.
Mammalian testes are highly sensitive to reactive oxygen species damage and particularly to lipid peroxidation due to testicular high content of polyunsaturated fatty acids [4].
Cryptorchidism results from the abnormal formation and descent of the testes. The testes form from the genital ridges, which lie on both sides of the midline and extend from T6 through S2 vertebrae in the developing embryo.
Previous northern hybridization studies confirmed that Galphaq mRNA was highly expressed in human tissues and organs associated with the human reproductive system, including the ovaries, prostate glands, and testes (Chen et al., 1996).