性器官-男性性器官
The Sex Organs - The Male Sex Organs

阴茎（ penis-拉丁语 尾）是一个含勃起组织的圆柱形的器官。说得更精确一点就是，在阴茎内，有3条纵贯全长的长形海绵体，两条长形的海绵体平行排列在上方，叫阴茎海绵体；一条沿着下方排列，为尿道海绵体。后者含有尿道（尿液和精液排出时经过的管道）。

The External Sex Organs: The Penis

The penis (lat. tail) is a cylindrical organ which contains erectile tissue. To be more precise, there are three elongated spongy bodies inside the penis which extend through its entire length-two running parallel on top (the two corpora cavernosa) and one running along the underside (the corpus spongiosum). This latter body contains the urethra (the duct through which urine and semen are released).

Left: corpora cavernosa
Right: corpus spongiosum