Which of the following muscles has its origin at the infraglenoid process?

The muscle originating at the infraglenoid process of the scapula is the triceps brachii. The infraglenoid process is a projection located below the glenoid cavity of the scapula, and it serves as the origin specifically for the long head of the triceps.

The triceps brachii is a powerful extensor of the elbow and is composed of three heads, which include the long head, lateral head, and medial head. The long head, originating from the infraglenoid process, also plays a role in shoulder joint stabilization and extension.

Understanding the anatomy and origins of these muscles is essential in sports massage and rehabilitation practices, as it helps in determining muscle functions and potential issues related to injuries in the shoulder and arm.