Triceps Brachii Long Head
Origin: Infraglenoid tubercle of the scapula
Insertion: Posterior surface of the olcranion process of the ulna
Actions: Extension of the arm at the shoulder, adduction of the arm at the shoulder, extension of the forearm at the elbow
Innervation: Radial nerve (C6, C7)
Blood Supply: Muscular branches and superior ulnar collateral and profunda brachii arteries from the brachial artery
Primary Actions of the Triceps Brachii Long Head
1. Extension of the arm at the shoulder
Agonists:
- Deltoid (posterior part)
- Latissimus Dorsi
- Pectoralis Major (sternal head)
- Teres Major
Antagonists:
- Deltoid (anterior part)
- Coracobrachialis
- Biceps brachii,
- Pectoralis major (clavicular head)
2. Adduction of the arm at the shoulder
Agonists:
- Latissimus Dorsi
- Pectoralis Major
- Teres Major
Antagonists:
- Supraspinatus
- Deltoid (middle part)
Note: Coracobrachialis and teres minor assist with adduction of the arm at the shoulder.
3. Extension of the forearm at the elbow
Agonists:
- Triceps Brachii (lateral and medial heads)
- Anconeus
Antagonists:
- Brachialis
- Biceps brachii
- Brachioradialis
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Triceps Brachii Lateral Head
Origin: Superior half of the posterior surface of the humeral shaft, lateral to the spiral groove
Insertion: Posterior surface of the olecranon process of the ulna
Actions: Extension of the forearm at the elbow
Innervation: Radial nerve (C6, C7)
Blood Supply: Muscular branches and superior ulnar collateral and profunda brachii arteries from the brachial artery
Primary Actions of the Triceps Brachii Lateral Head
1. Extension of the forearm at the elbow
Agonists:
- Triceps Brachii (long and medial head)
- Anconeus
Antagonists:
- Brachialis
- Biceps brachii
- Brachioradialis
Triceps Brachii Medial Head
Origin: Posterior shaft of the humerus, medial and distal to the spiral groove
Insertion: Posterior surface of the olecranon process of the ulna
Actions: Extension of the forearm at the elbow
Innervation: Radial nerve (C6, C7)
Blood Supply: Muscular branches and superior ulnar collateral and profunda brachii arteries from the brachial artery
Primary Actions of the Triceps Brachii Medial Head
1. Extension of the forearm at the elbow
Agonists:
- Triceps Brachii (long and lateral head)
- Anconeus
Antagonists:
- Brachialis
- Biceps brachii
- Brachioradialis
The triceps brachii muscle contributes to pain in the shoulder, elbow, arm, and hand.
An excellent book for those beginning the study of anatomy. Coloring helps memory retention.
For intermediary anatomy students learning skeletal and muscle structure.
For beginning and intermediary anatomy . Muscle overlays on the human body. Excellent visuals!