The supraglenoid tubercle is a small bony projection on the scapula just above the glenoid cavity. In Anatomy and Physiology I, it is the attachment point for the long head of the biceps brachii.
The supraglenoid tubercle is a small raised point on the scapula, sitting at the superior edge of the glenoid cavity. In Anatomy and Physiology I, you usually see it as one of the landmarks of the pectoral girdle and as the origin site for the long head of the biceps brachii tendon.
Think of the scapula as a flat, mobile bone with lots of attachment points, each one giving muscles a place to pull from or stabilize around. The supraglenoid tubercle is not a big structure, but it matters because it is positioned right above the shoulder socket. That location places the long head of the biceps in a path that crosses the shoulder joint before running down the arm.
Because the long head of biceps attaches there, this tubercle is part of how the biceps can assist with shoulder movements, especially stabilizing the humeral head in the glenoid cavity. The muscle is best known for elbow flexion and forearm supination, but its shoulder attachment means it also contributes to shoulder mechanics. That is why a bone feature this small shows up in both skeletal anatomy and muscle anatomy.
It helps to separate the bony landmark from the muscle itself. The supraglenoid tubercle is not the muscle and not the joint, it is the roughened spot on the scapula where connective tissue anchors. In lab, this is the kind of feature you identify on a bone model or diagram by locating the glenoid cavity first, then finding the superior bump just above it.
You may also see this term alongside other shoulder landmarks, because the pectoral girdle is packed with attachment sites that shape movement. The tubercle’s main job is simple, provide a firm anchor for the tendon. The effect is bigger than the size suggests, because shoulder motion depends on many small structures working together rather than one large hinge.
The supraglenoid tubercle matters because it connects a bone landmark to a real movement pattern. In Anatomy and Physiology I, you are not just memorizing scapula names, you are learning how shape supports function. This tubercle shows that idea clearly, since a tiny projection on the scapula helps position the biceps so it can act across the shoulder and the elbow.
It also gives you a concrete way to trace muscle attachment language. When a question asks where a muscle begins or attaches, the answer often depends on whether you are naming a bony process, a cavity, or a ridge. Here, the long head of the biceps brachii starts at the supraglenoid tubercle, so the landmark becomes part of the muscle’s anatomical description.
This term also comes up when you study the pectoral girdle as a motion system. The scapula is built for mobility, and its landmarks serve as anchor points for muscles that guide the upper limb. Knowing where the supraglenoid tubercle sits helps you make sense of how the shoulder stays stable while still allowing a wide range of motion.
If you mix up bone landmarks in lab, this one can be a useful anchor point because it sits right beside the glenoid cavity. Once you find the shoulder socket, you can orient yourself to the top edge and identify the tubercle from there. That kind of spatial thinking shows up in practicals, bone ID quizzes, and diagram labeling.
Keep studying Anatomy and Physiology I Unit 8
Visual cheatsheet
view galleryGlenoid Cavity
The supraglenoid tubercle sits right above the glenoid cavity, so these two landmarks are usually learned together. The cavity is the socket for the head of the humerus, while the tubercle is a nearby attachment site for the long head of the biceps brachii. Knowing one helps you find the other on a scapula model or bone diagram.
Biceps Brachii
The long head of the biceps brachii attaches to the supraglenoid tubercle, which is why this bone landmark matters in muscle anatomy. Even though the biceps is famous for elbow flexion, its shoulder attachment affects how the muscle crosses the joint and helps stabilize the humerus. That makes the tubercle part of both upper-limb movement and shoulder support.
Scapula
The supraglenoid tubercle is one of many scapular landmarks, and its location only makes sense when you know the shape of the scapula. The scapula provides broad surfaces and several projections for muscle attachment, but the supraglenoid tubercle is specifically tied to the shoulder joint region. It is a good example of how the scapula combines support with mobility.
Acromion Process
The acromion process and the supraglenoid tubercle are both landmarks on the scapula, but they sit in different regions and serve different purposes. The acromion is the broad, lateral projection you can feel at the top of the shoulder, while the supraglenoid tubercle is a smaller point above the glenoid cavity. Comparing them helps you avoid mixing up scapular features on diagrams.
A bone-identification quiz may show a scapula and ask you to label the spot where the long head of the biceps brachii attaches. You would find the glenoid cavity first, then identify the small bump just above it as the supraglenoid tubercle. In a muscle-matching question, you might need to connect that landmark to the biceps brachii and explain why the attachment matters for shoulder stability. On a practical, the trick is to use location, not size, because this feature is small but very specific.
The supraglenoid tubercle is a small bony projection on the scapula just above the glenoid cavity.
Its main anatomical job is to serve as the attachment site for the long head of the biceps brachii.
This landmark matters because the biceps crosses the shoulder joint, so its scapular attachment affects both movement and stability.
On bone diagrams, find the glenoid cavity first, then look just superior to it for the tubercle.
The term is most useful in Anatomy and Physiology I when you are connecting bone landmarks to muscle function.
It is a small projection on the scapula located above the glenoid cavity. The long head of the biceps brachii attaches there, so it is a standard landmark in shoulder anatomy.
You find it on the scapula, at the superior edge of the glenoid cavity. If you can locate the shoulder socket on the scapula, the tubercle is the bump just above it.
The long head of the biceps brachii attaches there. That attachment is one reason the biceps is involved in more than just elbow movement, since it also crosses the shoulder joint.
The glenoid cavity is the socket that receives the head of the humerus, while the supraglenoid tubercle is a nearby attachment point above that socket. One forms part of the joint surface, and the other serves as a muscle anchor.