1. Location: pectoralis, gluteus, brachial.
2. Size: maximus, minimus, longus, brevis.
3. Shape: deltoid, quadratus, teres.
4. Orientation: rectus.
5. Origin and insertion: sternocleidomastoid, brachioradialis.
6. Number of heads: biceps, triceps.
7. Function: abductor, adductor, masseter (chewer).