Waynetho wrote:"Distal" means "OUTSIDE" the body.
Distal and proximal are directions along an appendage from the origin of the appendage. Fingers are distal to your elbow. Your elbow is proximal to your fingers and distal to the shoulder, which is the origin of the arm.
For penile prosthesis the terms are used when measuring for the length of the cylinders. When the surgeon measures, they must pick a physical location on the penis as a reference point. This is usually part of the corporotomy. In my diagram I'm using the left of the corporotomy as the reference point. The surgeon will insert a measuring rod inside the corpora to the head of the penis (Distal) and record the length. Then turn the measuring rod around and insert till the bottom of the crus is determined. (Proximal) Then these two measurements are added to determine the length of cylinders required. The surgeon repeats this procedure for the other corpora.
The surgeon could choose the right side of the corporotomy or a mole on your penis as a reference point.
So the distal and proximal measurements have no correlation to penis size.