Lateral angle of scapula

The lateral angle of scapula is the thickest part of the bone and is often referred to as the head of the scapula. It primarily consists of the glenoid cavity, which articulates with the head of the humerus to form the glenohumeral joint, the main joint of the shoulder.

Key structures at the lateral angle of the scapula

1. Glenoid Cavity

• The primary articular surface of the humeral head.

• It is a shallow, pear-shaped fossa, oriented laterally and slightly anteriorly.

• A fibrocartilaginous rim, the glenoid labrum, lines the cavity, deepening it and enhancing stability for the shoulder joint.

2. Infraglenoid Tubercle

• Infraglenoid tubercle is located just below the glenoid cavity.

• Serves as the attachment site for the long head of the triceps brachii muscle.

3. Supraglenoid Tubercle

• Supraglenoid tubercle is positioned above the glenoid cavity.

• Acts as the attachment site for the long head of the biceps brachii muscle.

The neck of the scapula is a slightly constricted region that surrounds the head and glenoid cavity. It is more pronounced below and behind than above and in front.