What structure connects the humerus to the scapula?

The glenoid cavity is the correct structure that connects the humerus to the scapula. This shallow, cup-shaped socket is located on the lateral aspect of the scapula and serves as the articulation point for the head of the humerus. This joint, known as the glenohumeral joint, is crucial for the shoulder's wide range of motion, allowing for various movements such as flexion, extension, abduction, adduction, and rotation of the arm.

The coracoid process is a small, hook-like bony projection on the scapula that provides attachment points for muscles and ligaments but does not connect the humerus to the scapula directly. The spinous process refers to the bony protrusion along the back of the vertebrae and is not involved in the connection between the humerus and scapula. The acromion is an extension of the scapula that forms the highest point of the shoulder but does not directly articulate with the humerus either, although it plays a role in the shoulder girdle's overall structure and stability.