Coracoid process

The shoulder blade is a flat, triangular bone in the upper back. It has two parts that project forward. One is the Acromion at the top of the shoulder, and the other is the coracoid process, which curves out in front of the shoulder joint. The Korean term “ohwe” means “crow's beak,” and its plain-Korean name means “beak-shaped process.” It gets this name because it extends forward and outward like the tip of a bent finger.

The coracoid process is not a part that moves on its own. Instead, it acts like an anchor for several structures.

• Pectoralis minor (the smaller chest muscle) — This muscle runs up from the upper ribs and attaches to the coracoid process. It pulls the shoulder blade forward and downward.
• Coracobrachialis and the short head of the biceps brachii — These begin at the tip of the coracoid process as a shared tendon and run down into the arm. They help lift the arm forward and draw it toward the body. You can read more about this muscle in the Biceps brachii article.
• Ligaments — The Coracoclavicular ligament connects the coracoid process to the collarbone, suspending the shoulder blade so it does not sag. The Coracoacromial ligament connects it to the acromion, forming an arch-like roof over the shoulder joint. The coracohumeral ligament connects it to the upper arm bone and supports the front of the shoulder.

In other words, the coracoid process is a junction where forces from three directions meet: suspension from above through the ligaments, a pull from the chest through the pectoralis minor, and a connection toward the arm through the short head of the biceps and the coracobrachialis. This helps explain why the front of the chest, shoulder blade, and arm affect one another.

Find the hollow at the front of the shoulder, two or three finger-widths below the outer third of the collarbone. Press slowly into this area, and you will feel a hard bony tip beneath the muscle. The structure that stays in place even when you swing your arm forward and backward is the coracoid process.

It is not unusual for this spot to hurt when pressed. Because tendons come together here, the coracoid process tends to be sensitive to pressure even under normal circumstances. However, if one side is noticeably more painful, it may be worth checking whether the pectoralis minor on that side is more tense.

The area around the coracoid process is one of the first places associated with a forward-rounded posture. Spending long periods at a computer or looking at a smartphone shifts the shoulders forward, and the pectoralis minor shortens, pulling the coracoid process downward and forward. This can lead to sensations such as:

• Aching at the front of the shoulder, with pain around the coracoid process when pressed.
• A pulling sensation at the front of the chest when you move your arm backward or raise it overhead.
• Tightness in the upper chest and a feeling that the ribs move less when you take a deep breath.
• A catching sensation at the top of the shoulder when you raise your arm high. For the arm to rise smoothly over the shoulder blade, the area around the coracoid process needs to move properly. Similar connections are discussed in Shoulder impingement syndrome and Scapular dyskinesis.

Numbness or tingling in the arm, or a prickling sensation in the fingertips, is sometimes explained as resulting from compression of the nerves and blood vessels passing beneath the pectoralis minor (Brachial plexus). This passage lies just below the coracoid process.

Integrative Manual Therapy (IMT) describes the most prominent change as a posture in which the shoulder blade projects forward (protraction of the shoulder girdle) as the pectoralis minor pulls on the coracoid process. It also views the pectoralis minor as pulling the ribs downward, lowering the upper ribs and restricting breathing movements in the upper chest. This approach therefore assesses not only shoulder blade position but also tender points along the front of the chest from the sternoclavicular joint to the armpit, together with rib position. It describes releasing the area through a technique in which the head and neck are slowly flexed while lying down to find the position in which the body relaxes most comfortably. Looking beyond the front of the shoulder to include the chest and breathing is characteristic of this approach.

• Doorway stretch. Place your arm against a doorframe with your elbow bent at a right angle, then slowly move your body forward. Hold for about 20 seconds when you feel the front of your chest opening. Slightly changing the height of your arm can also release different parts of the pectoralis minor. Stop immediately if you feel numbness or tingling.
• Open your chest and breathe. Sit with both hands on your chest and feel your upper ribs expand as you breathe in. Breathing alone can help soften the pectoralis minor.
• Build strength to draw your shoulder blades together. If you only release the front, your shoulders can easily round forward again. Adding exercises that also use the back muscles, such as pulling a resistance band, helps create balance. See Rounded shoulders for related postural habits.
• Keep pressure gentle. Rather than rubbing hard on the coracoid process itself, it is more comfortable to gently press and release the side of the chest where the pectoralis minor lies, using your palm.
• Get up often. Once an hour, stand up, roll your shoulders backward, and open your arms wide.

If pain at the front of the shoulder spreads into the arm or hand, is severe enough to wake you at night, or if the coracoid area becomes swollen and painful after a fall or impact, have it checked at an orthopedic clinic. For recurrent shoulder dislocations, there is also a surgical procedure that transfers part of this bony projection to the front to stabilize the shoulder. Decisions like these are made by a specialist shoulder service.