Triceps Brachii

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Other Names Arm (Rear) Triceps Heads Long Head Lateral Head Medial Head Movement Elbow Extension [1, 2 , 3 ] Shoulder Extension [1 ] Adduction [1 ] Attachments Origin Scapula [1 ] Infraglenoid Turbercle Humorus (Posterior) Superior to Radial Groove [2 ] Inferior to Radial Groove [3 ] Insertion Ulna (Proximal Posterior) [1, 2 , 3 ] Olecranon Process

Comments The biarticulate long head of the triceps brachii [1 ] enters passive insufficiency through the completion of elbow flexion when the shoulders are more flexed and abducted or through the completion of shoulder flexion and abduction when the elbows are more flexed. The biarticulate long head of the triceps brachii [1 ] enters active insufficiency through the completion of elbow extension when the shoulders are more extended and adducted (other heads of the triceps becomes more active) or through the completion of shoulder extension and adduction when the elbows are more extended. When the shoulder is internally rotated, the ability of the long head of the triceps brachii to extend and adduct the shoulder is diminished. The shoulder must be externally rotated in order for the long head of the triceps brachii to assist shoulder adduction.