Download Diet Plan Week 1 Your Shoulder Muscles
Ok, so we can't start to build up the muscles in your shoulders without knowing what muscles make up your shoulders. Put simply, the shoulder is made up of two groups of muscles: extrinsic muscles, which originate from the torso and attach to the bones of the shoulder, and intrinsic muscles, which originate from the scapula and/or clavicle and attach to the humerus.
The Shoulder's Extrinsic Muscles
Trapezius
Your trapezius is the triangle-shaped muscle that runs down along your spine and across your shoulder blade. You have both a right and left trapezius; these muscles support your arms and shoulders and are needed to raise your arms.
Latissimus Dorsi
The latissimus dorsi muscle is one of the largest muscles in your back and is partially covered by the trapezius. Developing your "lats" will make it easier for you to manage your own body weight.
Levator Scapulae
Your levator scapulae muscle is located at the side and back of the neck. Its primary function is to lift the triangle-shaped bone located at the back of the shoulder (scapula) that connects your upper arm bone (humerus) with the clavicle (collarbone).
Rhomboids
The rhomboids are the muscles at the top of the back and middle of the shoulder blades. When they contract, they pull your shoulder blades together.
Deltoids
Your deltoid is made up of three main sets of muscle fibers: anterior, lateral and posterior, which are connected by a very thick tendon and are anchored into a V-shape. The deltoid muscle is primarily responsible for arm rotation, but it is also responsible for stopping dislocation and injury to the humerus when carrying heavy loads.
Teres Major
Teres major is a small muscle that's located on the underside of the upper arm. It's sometimes called "lat's little helper" because of its partnership with the latissimus dorsi.
Rotator Cuff
The rotator cuff is a group of muscles and tendons, including teres minor, that surround the shoulder joint. They keep the head of your upper arm bone firmly within the shallow socket of the shoulder.
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