The thrower's shoulder is subject to conditions and injuries that non-throwing shoulders are not. A unique set of injuries can occur, and it has been shown that it is possible to prevent most of these injuries by simple stretching and exercises.

Anatomy of the Normal Shoulder
Here is a diagram which gives a look at the inside of the normal shoulder

The Normal Throwing Motion
The throwing motion has been broken down into phases, and this page diagrams and explains each of these phases

Injures in the Thrower's Shoulder
This section will describe injuries that can happen in the shoulder of throwers that can result in time out from playing or need for season or career-ending surgery