WebMD's Penis Anatomy Page provides a diagram of the penis and describes its function, parts, and conditions that can affect the penis.
Anatomy. Lateral cross section of the penis.
The corresponding structure in lower invertebrates is often called the cirrus. The human penis is anatomically divided into two continuous areas—the body.
What are the external parts? Your penis and scrotum are the two parts of the male (or what's typically called male) external sex anatomy (outside your body).