Nomenclature of Muscles
The muscles have been named in a number of ways.
- According to their shape, e.g. trapezius, rhomboideus, scrratus anterior, latissimus dorsi, etc.
- According to the number of heads of origin, e.g. biceps, triceps, quadriceps, digastric, etc.
- According to their gross structure, e.g. scmilcndinosus, semi-‘membranosus, etc.
- According to their location, e.g. temporalis, supra-spinatus, intercostales.
- According to their attachments, e.g. stylohyoid, cricothyroid, etc.
- According to their action, e.g. adductor longus, flexor carpi ulnaris, abductor pollicis longus, etc.
- According to direction of their fibers, e.g. rectus abdominis, transversus abdominis, orbicularis oculi.
- A muscle with two bellies with an intervening tendon is called digastric muscle. Muscle with number of intervening tendons or intersections is the rectus abdominis.
- The muscles that extend over two or more joints are called diarthric or polyarthric muscles, e.g. flexor carpi radialis and flexor digitorum profundus.