In the rhabdocoela the sexual organs appear in their simplest forms—a testis anterior to a single or double ovary.
The testis of the male lies in the thorax, just below the heart.
A few dividing male somatic cells were found in the walls of the testis.
The number of segmental tubes connected with the testis varies very greatly.
The outer coat of the testis is called the tunica albuginea.
In the case of Reptilia the anterior two or three segmental tubes in the region of the testis probably have this function.
We see, therefore, how extremely important is the function of the testis.
In Birds a connection between the Wolffian body and the testis appears to be established as in the other types.
Spermatozoa originate in the testis as cells, which are filled with granules.
This wound healed without fungous growth from the remaining portion of the testis.
(plural testes), 1704, from Latin testis "testicle," usually regarded as a special application of testis "witness" (see testament), presumably because it "bears witness" to virility (cf. Greek parastates, literally "one that stands by;" and French slang témoins, literally "witnesses"). But Buck thinks Greek parastatai "testicles" has been wrongly associated with the legal sense of parastates "supporter, defender" and suggests instead parastatai in the sense of twin "supporting pillars, props of a mast," etc. Walde, meanwhile, suggests a connection between testis and testa "pot, shell, etc."
testis tes·tis (těs'tĭs)
n. pl. tes·tes (-tēz)
The male reproductive gland, the source of spermatozoa and the androgens, normally occurring paired in an external scrotum. Also called didymus, orchis.