10/23/2025
What is a scapula???
The scapula, commonly known as the shoulder blade, is a flat, triangular bone located at the back of the shoulder. It plays a crucial role in connecting the upper arm to the trunk of the body.
Anatomy of the Scapula
Key Features
Shape: Triangular and flat.
Location: Positioned on the posterior surface of the thoracic cage, behind the ribcage.
Articulations:
Connects to the humerus (upper arm bone) at the glenohumeral joint.
Connects to the clavicle (collarbone) at the acromioclavicular joint.
Important Parts
Glenoid Cavity: A shallow depression where the humerus fits, allowing for a wide range of shoulder movement.
Acromion: The bony tip that stabilizes the shoulder joint and connects with the clavicle.
Coracoid Process: A hook-like projection that provides attachment for muscles.
Functions of the Scapula
The scapula serves several important functions:
Movement: It allows the shoulder to move in multiple directions by serving as an anchor for various muscles.
Support: It supports the arm and helps maintain shoulder stability.
Muscle Attachment: It provides attachment points for numerous muscles involved in shoulder and arm movement, including the rotator cuff muscles.
Understanding the scapula's structure and function is essential for recognizing its role in shoulder mechanics and overall upper body movement.