Skip to main content

Anatomy and Mechanics of the Shoulder Joint

An in-depth explanation of the shoulder joint's anatomy, including its skeletal structure, stabilizing ligaments and tendons, muscular support from the rotator cuff, and the mechanics of its extensive range of motion. It also covers the neurovascular supply to the joint.

Save this reading to your study set

Sign up free

The shoulder joint, scientifically known as the glenohumeral joint, is a sophisticated ball-and-socket articulation that serves as the most mobile joint in the human body. This high degree of mobility, while essential for complex tasks involving the upper limb, necessitates a highly specialized arrangement of bones, ligaments, and muscles to maintain stability and prevent dislocation.

Skeletal Anatomy and Articulation

The fundamental structure of the shoulder joint is formed by the articulation between the head of the humerus (the "ball") and the glenoid cavity of the scapula (the "socket").

An illustration of the human shoulder joint, labeling the humerus, scapula, acromion, coracoid process, glenoid, and articular cartilage.
An illustration of the human shoulder joint, labeling the humerus, scapula, acromion, coracoid process, glenoid, and articular cartilage.

Because the glenoid cavity is relatively shallow, it does not provide much inherent bony stability. To compensate for this, the cavity is deepened and supported by the glenoid lip or glenoid labrum, a fibrocartilaginous structure that increases the surface area for the humeral head to rest upon.

An illustration of the human shoulder joint, showing the articulation between the humerus and the scapula, including ligaments and cartilage.
An illustration of the human shoulder joint, showing the articulation between the humerus and the scapula, including ligaments and cartilage.

Stabilizing Structures: Ligaments and Tendons

To prevent the humeral head from slipping out of the shallow glenoid cavity, several ligamentous structures provide passive stability:

  • Coracohumeral ligament: Connects the coracoid process of the scapula to the humerus.
  • Glenohumeral ligaments: Strengthen the anterior aspect of the joint capsule.
  • Transverse ligament of the humerus: Helps stabilize the relationship between the humerus and its surrounding structures.

Keep reading for free.

Create an account to finish this reading and make it part of your study routine.

Continue reading free

Already have an account? Log in

Updated

Study it your way.

Import this reading into your study set to get started with another study mode.

Make it your own.

Keep this reading in a new study set, or add it to one you already use.

Get started freeLog in