Testis
ReproductiveOrgansPelvisLeft and right
View left in 3D View right in 3D
Shown on the male body.
- What it is
- Oval gonad hanging in the scrotum on the spermatic cord, enclosed in the white fibrous tunica albuginea and divided into about 250 lobules packed with seminiferous tubules.
- Function
- Produces sperm (about 100 million a day) and the hormone testosterone from its interstitial Leydig cells.
- Size
- About 4.5 × 2.5 × 3 cm, 15–25 mL.
- Clinical note
- Kept 2–3 °C below core temperature; the left usually hangs a little lower. An undescended testis raises the risk of infertility and cancer.