Testicle

Testicle
Testicle
	Diagram of inner structures of a human testicle (the labelling "seminal vesicle lobules" is incorrect and should be "testicular lobules" instead)
	Diagram of the external features and surrounding structures of the testicles of an adult male
Details
Artery	Testicular artery
Vein	Testicular vein, pampiniform plexus
Nerve	Spermatic plexus
Lymph	Lumbar lymph nodes
Identifiers
Latin	testis
MeSH	D013737
TA98	A09.3.01.001
TA2	3576
FMA	7210
	Anatomical terminology

Animation of the migration of spermatozoa from their origin as germ cells to their exit from the vas deferens. A) Blood vessels; B) Head of epididymis; C) Efferent ductules; D) Seminiferous tubules; E) Parietal lamina of tunica vaginalis; F) Visceral lamina of tunica vaginalis; G) Cavity of tunica vaginalis; H) Tunica albuginea; I) Lobule of testis; J) Tail of epididymis; K) Body of epididymis; L) Mediastinum testis; M) Vas deferens.

A testicle or testis (pl. testes) is the gonad in all male bilaterians, including humans, and is homologous to the ovary in females. Its primary functions are the production of sperm and the secretion of androgens, primarily testosterone.

The release of testosterone is regulated by luteinizing hormone (LH) from the anterior pituitary gland. Sperm production is controlled by follicle-stimulating hormone (FSH) from the anterior pituitary gland and by testosterone produced within the gonads.