What is the proximal attachment point of the long head of the triceps brachii?

The long head of the triceps brachii originates at the infraglenoid tubercle of the scapula. This specific attachment is important because it is located just below the glenoid cavity, contributing to the muscle's function in both shoulder and elbow extension. The position of the long head allows it to assist in stabilizing the shoulder joint while also being involved in movements such as extending the arm at the elbow. Understanding this anatomical relationship is crucial for recognizing how the triceps brachii contributes to upper limb movements, especially those that involve pulling or extending the arm overhead.