Preparation

General Instructions:  After the third dribble maintain that initial stance position, drop down where your knees are flexed and your weight is going through the heels of your feet. Think of your lower body as if you were attempting to do a squat. Bring the ball up to be ready for the shot. The hand placement on the ball with your dominant hand behind the front of the ball and the non-dominant hand on the side with light grip to guide you through the follow through. Your dominant elbow will be flexed approximately 90 degrees with will also flex your shoulder. The non-dominant arm will be relaxed to allow that hand to guide.

Shoulder Girdle:  When returning to stance position your shoulder girdle will maintain that posture/straight back adduction using your rhomboids and middle/lower fibers of your trapezius. As you bring the ball up in front of your head, you will have bilateral upward rotation using your middle/lower trapezius  and serratus anterior muscles of your shoulder girdles.  These will be concentric contractions.
Shoulder Joint:  When returning to your set position your bilateral shoulder joints will be flexed to about 90 degrees.  The muscles you will be using to flex your shoulder joint at approximately 90 degrees are the pectoralis major upper fibers and deltoid anterior fibers.
Elbow/ Radioulnar Joints:  Flexion of your elbow will activate biceps brachii, brachialis, and brachradialis.  Since you will be holding the ball towards the basket this will be radiounlar pronation which will be activating your pronator teres and pronator quadratus of your dominant hand.  The non dominate hand (shown as the Left in the picture) will be in the neutral position and this will be using the brachioradialis.
Hip Joint/ Pelvic Girdle:  Flexion of your hip to get that mid squat position will cause eccentric contraction of your gluteus maximus, semimembranosus, semitendinosus, and biceps femoris.
Knee  Joint:  Flexion of the knee causes eccentric contraction of the rectus femoris, vastus medialis, vastus intermedius, and vastus lateralis which all comprised your quadriceps.