Testicle

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Testicle
How the testicles work from the inside.
Diagram of male (human) testicles
Details
Artery	Testicular artery
Vein	Testicular vein, Pampiniform plexus
Nerve	Spermatic plexus
Lymph	Lumbar lymph nodes
Identifiers
Latin	testis
MeSH	D013737
TA	A09.3.01.001
FMA	7210
Anatomical terminology [edit on Wikidata]

Testicles are parts that are found on the bodies of male creatures. Male mammals, including humans, have two testicles, supported in a sac of skin below the penis called the scrotum. Along with the penis, testicles are called reproductory organs or "sex organs". Only males have testicles; females have ovaries.

Testicles are a type of organ called glands. Like other glands, testicles make chemical substances, called hormones that keep the body working. Testicles also make sperm, which can join with ova to make new life.

Most glands, like ovaries, are inside the body. However, testicles are outside the main part of the body. This is because the testicles work better if they are cooler than the inside of the body.^[1] In cold weather, testicles pull up nearer to the body to keep warm.

1. ↑ Jones, Richard (2013). Human Reproductive Biology. Academic Press. p. 74. ISBN 9780123821850. The rear-entry position of mating may allow the scrotum to stimulate the clitoris and, in this way, may produce an orgasm ...