Which muscle attaches to the infraglenoid tubercle?

The triceps brachii muscle attaches to the infraglenoid tubercle of the scapula. This muscle plays a crucial role in the extension of the elbow and is one of the primary muscles responsible for this movement. The infraglenoid tubercle is located on the scapula's inferior aspect of the glenoid cavity, serving as an important point of origin for the long head of the triceps.

Understanding the anatomy of the shoulder and upper arm is vital for grasping the functions of these muscles. The triceps brachii consists of three heads: the long head, which originates from the infraglenoid tubercle, and the lateral and medial heads, which originate from the humerus. The long head's attachment to the scapula contributes to its function, as it can assist in shoulder extension, in addition to its primary role in elbow extension.

The other choices are related to different actions or areas of attachment, but they do not connect to the infraglenoid tubercle. Thus, the triceps brachii is the only muscle among the options that directly connects to this specific anatomical landmark.