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10 Cards in this Set
- Front
- Back
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What are the two groups of muscles that move the humerus? |
Axial (pectoralis major & latissimus dorsi) Scapular (Deltoid, subscapularis, supraspinatus, infraspinatus, teres major, teres minor, corachobrachialis) |
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Pectoralis Major |
Origin: clavicle, sternum, costal cartilage (2-7) Insertion: Greater tubercle (humerus) Action: as a whole: adducts, medially rotates arm at shoulder |
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Latissimus Dorsi |
Origin: Spines (T and L), sacrum, ilium Insertion: Intertubercular sulcus (humerus) Action: Extends, adducts and medially rotates arm at shoulder joint |
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Deltoid |
Origin: Acromion (scapula & clavicle), spine (scapula) Insertion: Deltoid tuberosity (humerus) Action: |
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Subscapularis |
Origin: subscapular fossa (scapula) Insertion: Lesser tubercle (humerus) Action: Medially rotates arm at shoulder joint |
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Supraspinatus |
Origin: supraspinous fossa (scapula) Insertion: Greater tubercle (humerus) Action: assists deltoid, abduction of arm at shoulder |
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Infraspinatus |
Origin: infraspinous fossa (scapula) Insertion: Greater tubercle (humerus) Action: laterally rotates arm at shoulder |
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Teres Major |
Origin: Inferior angle (scapula) Insertion: Intertubercular sulcus (humerus) Action: Extends arm at shoulder Assists in adduction and medial rotation of arm at shoulder |
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Teres Minor |
Origin: Inferior lateral border (scapula) Insertion: Greater tubercle (humerus) Action: Laterally rotates and extends arm at shoulder |
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Corachobrachialis |
Origin: coracoid process (scapula) Insertion: Humerus shaft Action: Flexes and abducts arm at shoulder |
