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General Anatomy
Two words for you: Coracoid Process.

The coracoid process is a boney nub poking from the front of the shoulder blade toward the chest.

Pec Minor arises up from ribs 3, 4, and 5. It’s tendon attaches to the coracoid process, as Pectoralis Minor binds together our front and back.

When It’s Squishy Pec Minor is very important for shoulder blade stabilization. The shoulder blade itself is like a board the arm presses back against to steady the hands for fine work: eating, writing and general enjoyment of the opposable thumb.

When Not Squishy Pectoralis Minor becomes TYRANNOSAURUS CHEST. Shoulder range of motion is compromised as the shoulders pull forward. Upper body performance decreases with less shoulder range of motion. Low back pain increases with stooping. Better posture comes via permission of TYRANNOSAURUS CHEST.

Getting Tyrannosaurus Chest

Past Trauma –old accidents and near misses such as catching ourselves in a fall, lots of tennis, gymnastics and yoga which tax the shoulder also tax Pectoralis Minor causing micro internal bleeding and the remnants of muscle constriction last long after injury occurred.

Overuse Injury Active Overuse –a swing of the bat, a golf club, an overthrow and weight lifting will bring on Tyrannosaurs Chest as the pectoralis minor helps connect our core to the shoulder blade

Passive Overuse –long stretches of manual work such painting, writing and typing exhaust the pectoralis minor because the shoulder blade must remain stabilized for a long time

Repetitive Stress –Pectoralis Minor also assists in breathing, a stress we definitely wish to keep repetitive which nonetheless can become hostile to us

Disuse Injury –sitting forward with poor posture (a mostly unavoidable act) chronically shortens the pectoralis minor bringing on Tyrannosaurus Chest

Emotional State -the muscular signature of negative emotions is tightness, and negative thought will exacerbate Tyrannosaurus Chest bringing shoulders forward and bringing the cyclic pain of poor posture

Trauma Begets Trauma –Tyranosaurus Chest, by compromising the posture, will contribute to trauma development all over the 8 Crossroads