MuscleMonday - Pectoralis Major

MuscleMonday - Pectoralis Major

There are 2 heads (parts) to the thick, fan-shaped pectoralis major muscle.  

The Clavicular head originates  from the 1/2 of the clavicle bone closest to the centre line of the body

The Sternal head originates from the Manubrium (upper section) and Body (lower section) of the sternum. 

Both heads come together to a flat tendon that inserts on the humerus (upper arm) bone.

Your pectoralis major has 4 actions - and is primarily responsible for movement of the shoulder joint.  

1 - Flexion of the humerus - like in an underhand ball throw

2 - Adduction of the humerus - like in flapping your arms

3 - Rotation of the humerus towards the middle of the body - like in arm wrestling

4 - Stability in keeping the arm attached to the trunk of your body. 

Building muscle size increases the functionality of this muscle.  We’ll work the pectoralis major through a combination of multi-joint and single-joint exercises with maximum activation being achieved through pressing motions.  Sculpting the pectoralis major towards the sternum can be achieved through wider hand positions.  

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