The shoulder is a highly mobile joint that connects the arm to the body, allowing a wide range of motion. It consists of bones, joints, and soft tissues that work together for movement and stability.

Main Components of the Shoulder

1. Clavicle (Collarbone)

   • Acts as a bridge between the sternum (chest bone) and the scapula (shoulder blade).
   • Provides structural support and stability to the shoulder.

2. Acromioclavicular Joint (AC Joint)

   • Connects the clavicle to the acromion of the scapula.
   • Helps with shoulder movement and absorbs forces from the arm.

3. Acromion

   • A bony projection on the scapula that forms the highest part of the shoulder.
   • Provides attachment for muscles and ligaments.

4. Glenohumeral Joint (Shoulder Joint)

   • A ball-and-socket joint between the head of the humerus (upper arm bone) and the glenoid cavity of the scapula.
   • Allows rotation and movement in multiple directions.

5. Scapula (Shoulder Blade)

   • A flat, triangular-shaped bone that provides attachment points for muscles involved in shoulder and arm movement.

6. Humerus (Upper Arm Bone)

   • The bone of the upper arm that connects to the scapula at the shoulder joint.
   • Plays a crucial role in arm movement and lifting.

These components work together to provide flexibility, strength, and stability, making the shoulder one of the most versatile joints in the human body.