Biceps brachii vs Deltoid
| Property | Biceps brachii | Deltoid |
|---|---|---|
| Latin Name | Musculus biceps brachii | Musculus deltoideus |
| Type | Muscle | Muscle |
| Body System | Muscular | Muscular |
| Body Region | Upper Arm | Shoulder |
| Function | Primary supinator of the forearm and powerful flexor of the elbow. Also assists in shoulder flexion. The long head assists in shoulder joint stabilization. | The primary abductor of the shoulder joint. The anterior fibers flex and medially rotate the arm. The posterior fibers extend and laterally rotate the arm. Gives the shoulder its rounded … |
| Clinical Significance | Biceps tendon ruptures cause a visible bulge (Popeye deformity). Bicipital tendinitis causes anterior shoulder pain. The biceps reflex tests the C5-C6 nerve roots. | Deltoid paralysis from axillary nerve injury prevents arm abduction. The deltoid is a common site for intramuscular injections. Rotator cuff tears may cause compensatory deltoid overuse. |
| FMA ID | 37670 | 32521 |