Shoulder Flashcards
Deltoid origin
Spine of the scapula, acromion, lateral 1/3 of clavicle
Deltoid action
Abducts arm; anterior fibers can flex arm, posterior fibers can extend arm
Supraspinatus origin
Supraspinous fossa
Supraspinatus insertion
Greater tubercle of humerus (superior part)
Supraspinatus action
Abducts arm
also responsible for initiating abduction
Infraspinatus origin
Infraspinous fossa
Infraspinatus insertion
Greater tubercle of humerus (middle part)
Infraspinatus action
Laterally rotates arm
Teres minor origin
Lateral border of scapula
upper half
Teres minor insertion
Greater tubercle of humerus (inferior part)
Teres minor action
Laterally rotates arm
Teres major origin
Lateral border of scapula
lower half and inferior angle
Teres major insertion
Anterior side of humerus (medial lip of intertubercular groove)
Teres major action
Extends and medially rotates arm
Subscapularis origin
Subscapular fossa
Subscapularis insertion
Lesser tubercle of humerus
Subscapularis action
Adducts and medially rotates arm
Pectoralis major origin
Clavicular head: medial ½ of clavicle
Sternocostal head: sternum and adjacent costal cartilages
Pectoralis major insertion
Anterior side of humerus (lateral lip of intertubercular groove)
Pectoralis major action
Flexes, adducts and medially rotates arm
Pectoralis minor origin
Ribs 3-5
Pectoralis minor insertion
Coracoid process of scapula
Pectoralis minor action
Depresses scapula and assists with protraction
Serratus anterior origin
Upper ribs (typically 1-8)
Serratus anterior insertion
Medial border of the scapula (anterior side)
Serratus anterior action
Protracts and laterally rotates scapula
Deltoid insertion
Deltoid tuberosity of humerus
