Coracoid

Coracoid Process

Diagram of the coracoid process and surrounding muscles.

The coracoid process is a small hook-like structure on the lateral edge of the superior anterior portion of the scapula. It is an important anatomical landmark in the shoulder region and serves as an attachment point for several muscles and ligaments.

Anatomy

The coracoid process projects anteriorly and laterally from the scapula, providing a stabilizing structure for the shoulder joint. It is palpable just below the lateral end of the clavicle.

Muscle Attachments

Several muscles attach to the coracoid process, playing crucial roles in the movement and stabilization of the shoulder:

• Pectoralis minor: This muscle originates from the third to fifth ribs and inserts onto the coracoid process. It functions to stabilize the scapula by drawing it anteriorly and inferiorly against the thoracic wall.

• Coracobrachialis: Originating from the coracoid process, this muscle inserts onto the medial surface of the humerus. It acts to flex and adduct the arm at the shoulder joint.

• Biceps brachii (short head): The short head of the biceps brachii originates from the coracoid process and joins with the long head to insert onto the radial tuberosity. It is involved in flexion of the elbow and supination of the forearm.

Ligament Attachments

The coracoid process also serves as an attachment point for several ligaments:

• Coracoacromial ligament: This ligament extends from the coracoid process to the acromion, forming a protective arch over the head of the humerus.

• Coracoclavicular ligament: Comprising the conoid and trapezoid ligaments, this structure connects the coracoid process to the clavicle, providing stability to the acromioclavicular joint.

Clinical Significance

The coracoid process is a key landmark in various surgical procedures involving the shoulder. It is also a site of potential injury, such as fractures or avulsion injuries, often resulting from direct trauma or excessive muscular contraction.

Related Pages

• Scapula
• Shoulder joint
• Pectoralis minor
• Biceps brachii