WebMD's Penis Anatomy Page provides a diagram of the penis and describes its function, parts, and conditions that can affect the penis.
Penis, the copulatory organ of the male of higher vertebrates that in mammals usually also provides the channel by which urine leaves the body.
Anatomy. Lateral cross section of the penis.
The penile shaft is composed of 3 erectile columns, the 2 corpora cavernosa and the corpus spongiosum, as well as the columns' enveloping.