The shoulder muscles are responsible for maintaining the widest range of motion of any joint in your body. This flexibility is also what makes the shoulder prone to instability and injury. Muscles, ...

Deep muscles The abdominal muscles provide postural support, protect internal organs, and perform other important functions. The lower abdominal muscles help protect the pelvic cavity. The rectus ...

The top diagram shows the position of an American alligator's liver and lungs and four muscles or muscle groups that the animals use to shift their lungs forward, backward or sideways to control their ...