The Shoulder Joint
Clayton Payne
Deltoid
Insertion - Lateral Surface of Humerus
Joints Crossed - Shoulder
Joint Actions - Anterior fibres flex the shoulder and assist in horizontal flexion and medial rotation, All fibres abduct the shoulder, Posterior fibres extend the shoulder and assist in lateral rotation
Pectoralis Major
Insertion - Top of Humerus
Joints Crossed - Shoulder Joint
Joint Action - Shoulder horizontal flexion, adduction and medial rotation
Latissimus Dorsi
Insertion - Top of Humerus
Joints Crossed - Shoulder Joint
Joint Action - Origin fixed: adducts and extends arm. Assists in medial rotation of arm. Depresses shoulder girdle via insertion of humerus. Insertion fixed: tilts the pelvis forward
Teres Major
Insertion - Humerus
Joints Crossed - Shoulder Joint
Joint Action - Medial rotation, adduction and extension of shoulder joint