from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun One of the paired male reproductive organs that produce spermatozoa and male sex hormones in humans and other vertebrates.
- noun An analogous gland in an invertebrate animal, such as a flatworm or a mollusk.
from The Century Dictionary.
- noun A testicle.
- noun Some rounded formation likened to a testicle: as, the testes of the brain.
from the GNU version of the Collaborative International Dictionary of English.
- noun (Anat.) A testicle.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun anatomy A
testicleof a vertebrate
- noun biology An
analogous glandin invertebratessuch as the hydra
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- noun one of the two male reproductive glands that produce spermatozoa and secrete androgens
from The American Heritage® Dictionary of the English Language, 4th Edition
The receptors are everywhere, but the testis is exquisitely sensitive to the drug.
From my own observations, I am led to believe that no such muscular structure as a gubernaculum exists, and therefore that the descent of the testis is the effect of another cause.
The lateral surface, head and tail of the epididymis are free and covered by the serous membrane; the body is also completely invested by it, excepting along its posterior border; while between the body and the testis is a pouch, named the sinus of the epididymis (digital fossa).
The one above the testis is the plica vascularis, and contains ultimately the internal spermatic vessels; the one below, the plica gubernatrix, contains the lower part of the gubernaculum, which has now grown into a thick cord; it ends below at the abdominal inguinal ring in a tube of peritoneum, the saccus vaginalis, which protrudes itself down the inguinal canal.
-- The male reproductive element of animals is formed by an organ called the testis, or testicle, of which each male possesses two.
The testis is a pretty awesome organ, comprised mainly of a bunch of coiled loops called seminiferous tubules.
The sperm starts in the male gonad, otherwise known as the testis, and various other things more suited for the locker room than this esteemed blog.
SRY = Sex-determining region Y - aka testis determining factor = TDF - Causes gonad to differentiate into testes SRY protein is DNA-binding regulatory protein Acts as transcription factor Initiates transcription of cascade of genes necessary for testicular differentiation
Juan Pelota footnote from the W-pedia: "The Latin word 'testis', witness, was used in the firmly established legal principle 'Testis unus, testis nullus' one witness equals no witness..."
Spermatozoa travel through the lumen of the seminiferous tubules to the rete testis which is basically a big collecting duct that all the seminiferous tubules empty into.