Clavicle Anatomy and Function

Clavicle Anatomy and Function

• The clavicle, or collarbone, acts as a strut, holding the scapula (shoulder blade) in place, allowing for free arm movement.
• It also provides attachment points for muscles that move the shoulder and arm.
• Key bony landmarks include the sternal end (articulates with the sternum), acromial end (articulates with the scapula), and the shaft.
• The clavicle's structure enables a wide range of shoulder motion and stability.

Clavicle Structure

• The clavicle comprises three main parts: the sternal end, the acromial end, and the shaft.
• The sternal end connects to the manubrium of the sternum.
• The acromial end connects to the acromion of the scapula.

Clavicle Injuries and Treatment

• Common injuries include fractures, often treated with rest, immobilization, and sometimes surgery.
• Dislocations, less frequent, usually stem from forceful trauma.
• Malunion (improper healing) from fractures can lead to shoulder problems.
• Delayed or non-union of the fracture can cause chronic pain and disability.

Clavicle Blood Supply and Innervation

• Blood supply comes from the internal thoracic artery and the external thoracic artery.
• Innervation is via the supraclavicular nerve, a branch of the cervical plexus.

Clavicle Differences and Diseases

• Left and right clavicles differ slightly in length, shape (S-shaped vs. U-shaped), and curvature.
• The left clavicle is generally longer and more S-shaped than the right.
• Common diseases include fractures, dislocations, clavicular nonunion, and acromioclavicular joint osteoarthritis.

Clavicle-Attached Muscles

• Muscles attached to the clavicle include the sternocleidomastoid, trapezius, deltoid, supraspinatus, and infraspinatus.