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Torso

BIOL131

MuscleOrigin and InsertionAction
External Oblique (O) Outer surfaces of lower 8 ribs (I) Linea alba; anterior half of iliac crest Flexes laterally; Flexes and rotates trunk; compresses abdomen
Infraspinatus (O) Infraspinus Fossa (I) Greater tubercle of humerus Laterally rotates arm
Internal oblique (O) Lumbodorsal fascia, iliac crest and inguinal ligament (I) Linea alba, pubic crest, last 3 or 4 ribs Compresses abdomen; flexes and rotates femur
Latissimus Dorsi (O) Spines of vertebrae T7-S5; lower 3-4 ribs and iliac crest (I) Intertubercle groove of humerus Extends, adducts and medially rotates arm
Pectorials major (O) Clavicle; sternum; cartilage of ribs 1-6; aponeurosis of external oblique (I) Greater tubercle of humerus Flexes, adducts and medially rotates arm
Pectoralis Minor (O) Anterior surface of ribs 3-5 (I) Coracoid Process Depresses and pulls scapula anterioraly
Rectus Abdominus (O) Pubic crest and symphysis (I) Xiphoid process, costal cartilages 5-7 Compresses abdomen; flexes trunk
Serratus Anterior (O) Outer surface of ribs 1-8 (or 9) (I) Entire anterior surface of vertebral boreder of scapula Abducts and stabilizes scapula
Subscapularis (O) Subscapular fossa (I) Lesser tubercle of humerus Medially rotates arm
Supraspinatus (O) Supraspinous fossa (I) Greater tubercle of humerus Abducts arm
Teres major (O) Posterior surface of scapular at inferior angle (I) Lesser tubercle of humerus Extends, medially rotates, and adducts arm
Teres minor (O) Axillary border of scapula (I) Greater tubercle of humerus Laterally rotates arm
Transverse Abdominis (O) Inguinal ligament; lumbodorsal fascia; costal cartilages of lower ribs; iliac crest (I) Linea Alba; pubic crest Compresses abdomen
Trapezius (O) Occipital bone; ligimentumnuchae spines of vertebrae C7-T12 (I) Acromion and spine of scapula; Lateral third of clavicle Elevates, depresses, rotates, adducts and stabalizes scapula
External intercoastals (O) Inferior border of rib above (I) Superior border of rib below Draws ribs together
Created by: RachReile
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