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睾丸是阴囊中的两个卵圆形的灰白色器官,通常左侧的位置较右侧略低。每一睾丸约有3～4厘米长,2.5厘米宽。它的背面近外侧,和附睾相连,两侧和前方是鞘膜腔,表面附着脏层鞘膜。在鞘膜下,睾丸表面有一层白色坚韧的纤维组织,称为白膜。睾丸里有许多纤维隔膜,将睾丸分成许多小叶,每个小叶有许多精细管,精细管相互连接成睾丸网,经输出小管和附睾相通。睾丸具有产生精子和分泌激素的双重功能。男子在青春期后,精细管内的生殖细胞逐渐发育成熟而形成
Testicles are two oval gray organs in the scrotum, usually slightly lower on the left than on the right. Each testicle is about 3 to 4 cm long and 2.5 cm wide. Its back near the lateral, and attached to the epididymis, on both sides and in front of the sheath cavity, the surface attached to the visceral sheath. Under the sheath, the testicle surface has a layer of white tough fibrous tissue, called the white membrane. There are many testicles in the fibrous septa, the testis is divided into many leaflets, each leaflet has many fine tubes, fine tubes connected to each other into a testis network, the output of the small tube and epididymis communicating. Testicles have the dual function of producing sperm and secreting hormones. Men after puberty, fine tube within the germ cells gradually mature and formed