Coracobrachialis

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Coracobrachialis is the smallest of the three muscles of the anterior compartment of the upper arm.

Coracobrachialis
Coracobrachialis.GIF
Anterior chest wall and upper arm showing coracobrachialis
System: Muscle
Function: Flexion and adduction of the humerus at the shoulder
Origin: Coracoid process of the scapula
Branches:
Insertion: Medial humerus
Arterial supply:
Venous drainage:
Lymphatic drainage:
Innervation: Musculocutaneous nerve (C7)
Vertebral levels:
Search for Coracobrachialis in Gray's.

Contents

Shape

Coracobrachialis is situated in the superiomedial part of the upper arm. It arises from the apex of the coracoid process with the tendon of the short head of biceps brachii, as well as from the intermuscular septum between coracobrachialis and biceps. Its insertion is via a flat tendon between the origins of triceps and brachialis. It is perforated by the musculocutaneous nerve.

Actions

Joints Affected

Origin

Insertion

  • An impression in the middle of the medial aspect of the body of the humerus, between the origins of triceps and brachialis.

Nerve Supply

Relations

Variations

  • May have a bony head reaching the medial epicondyle
  • May rarely have a short head to the lesser tubercle
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