Muscle
Coracobrachialis
Links the coracoid to the medial arm
High-yield
Coracobrachialis is a useful landmark for the musculocutaneous nerve, but the nerve's course can vary.
Overview
From the coracoid tip, this slender muscle descends to the middle of the humerus. It draws the arm forward and inward at the shoulder. The musculocutaneous nerve usually passes through it.
Reference facts
- Origin
- Tip of the scapula's coracoid process
- Insertion
- Medial humeral shaft around its midpoint
- Action
- Assists shoulder flexion and arm adduction
- Innervation
- Musculocutaneous nerve, C5–C7
- Blood supply
- Muscular branches from the brachial artery
Clinical correlation
A musculocutaneous nerve injury in this region can affect more than coracobrachialis: elbow flexion and supination may weaken, and sensation over the lateral forearm may change.
Frequently asked questions
What does the coracobrachialis do?
The coracobrachialis assists shoulder flexion and arm adduction.
What nerve innervates the coracobrachialis?
The coracobrachialis is innervated by the musculocutaneous nerve, C5–C7.
Where does the coracobrachialis attach?
Origin: Tip of the scapula's coracoid process. Insertion: Medial humeral shaft around its midpoint.
What is the blood supply of the coracobrachialis?
The coracobrachialis is supplied by the muscular branches from the brachial artery.