What is the proximal attachment for the long head of the biceps brachii?

The long head of the biceps brachii is anchored at the proximal attachment point known as the supraglenoid tubercle of the scapula. This specific anatomical site is located above the glenoid cavity of the scapula, where the tendon of the long head begins. The attachment at the supraglenoid tubercle allows the biceps to contribute to several functions, including flexion of the elbow and supination of the forearm, which are vital for various arm movements.

The location of this attachment is significant because it provides stability for the tendon as it passes over the humeral head, and it plays a crucial role in shoulder mechanics. Understanding this attachment is essential for recognizing how the biceps brachii functions in both the upper arm and shoulder movements.