Think of triceps as 1 head on the scapula, 2 heads on the humerus.
If the origin is on the scapula → it must influence the shoulder too.
That’s why the long head assists with shoulder extension and adduction, while all 3 heads extend the elbow.
📍 Origins:
Long head: infraglenoid tubercle of scapula
Lateral head: posterior humerus superior to radial groove
Medial head: posterior humerus distal to radial groove
📍 I (all): olecranon process of ulna
📍 A: extend elbow, extend shoulder (long head)
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