Coracobrachialis Muscle
Origin: Lateral aspect of the apex of the coracoid process of the scapula
Insertion: Medial aspect of the midshaft of the humerus
Actions: Flexion of the arm at the shoulder
Innervation: Musculocutaneous nerve (C5 C6 C7)
Blood Supply: Muscular branches from the brachial artery
Primary Actions of the Coracobrachialis
1. Flexion of the arm at the shoulder
Agonists:
- Deltoid (anterior part)
- Biceps Brachii
- Pectoralis Major (clavicular head)
Antagonists:
- Deltoid (posterior part)
- Triceps Brachii (long head)
- Latissimus Dorsi
- Pectoralis Major (sternal head)
- Teres Major
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Secondary Actions of the Coracobrachialis:
1. Assists with adduction of the arm at the shoulder
Agonists:
- Latissimus Dorsi
- Teres Major
- Pectoralis Major
- Triceps Brachii (long head)
Antagonists:
- Deltoid (middle part)
- Supraspinatus
Coracobrachialis and teres minor assist with adduction of the arm at the shoulder when the arm is returning from the abducted position.