The scapula, commonly known as the shoulder blade, is a flat, triangular-shaped bone located on the back of the rib cage. It forms part of the shoulder joint, connecting with the humerus (upper arm bone) at the glenohumeral joint and the clavicle (collarbone) at the acromioclavicular joint.
The scapula plays a crucial role in shoulder movement and stability, allowing for a wide range of arm motions.
Key features of the scapula include:
- Two surfaces:
- Costal surface: Faces the rib cage.
- Dorsal surface: Faces the back.
- Three borders:
- Superior border: Top edge.
- Medial border: Inner edge.
- Lateral border: Outer edge.
- Three angles:
- Superior angle: Where the superior and medial borders meet.
- Inferior angle: Where the medial and lateral borders meet.
- Lateral angle: Where the superior and lateral borders meet.
The scapula is a vital component of the shoulder girdle, and its proper function is essential for arm movement and overall shoulder health.
