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Glossary of Muscles of the Shoulder and Trunk

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Created by ArmandoIbarra-Espinoza

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Trapezius
Action - Draws scapula medially

Origin - Spines of cervical and thoracic vertebra

Insertion - Clavicle & scapular spine



Deltoid
Action - Abducts humerus

Origin - Clavicle & scapular spine

Insertion - Deltoid tuberosity



Supraspinatus
Action - Abducts humerus

Origin - Supraspinous fossa

Insertion - Greater tubercle of humerus



Infraspinatus
Action - Adducts and laterally rotates humerus

Origin - Infraspinous fossa

Insertion - Greater tubercle of humerus



Teres major
Action - Retracts, adducts, & medially rotates arm

Origin - Inferiour angle of scapula

Insertion - Lesser tubercle of humerus



Teres minor
Action - Adducts and laterally rotates humerus

Origin - Axilary border of scapula

Insertion - Greater tubercle of humerus



Erector spinae
Action - (2) Extends or (1) laterally flexes vertebral column

Origin - Lower vertebral column, ilium, and ribs

Insertion - Spinous and transverse processes of upper vertebral column



Serratus anterior
Action - Superiourly rotates & abducts scapula

Origin - Ribs 1-8

Insertion - Vertebral border of scapula



Subscapularis
Action - Medially rotates humerus

Origin - Subscapular fossa

Insertion - Lesser tubercle of humerus



Levator scapulae
Action - Elevates scapula

Origin - Transverse processes of C1 to C4

Insertion - Vertebral border of scapula



Pectoralis major
Action - protracts, adducts, and medially rotates arm

Origin - clavicle, sternum & ribs 2-6

Insertion - Greater tubercle of humerus



Pectoralis minor
Action - Depresses scapula

Origin - Ribs 3-5

Insertion - Coracoid process of scapula



External intercostals
Action - Elevates ribs at inhalation

Origin - Inferior margin of previous rib

Insertion - Superior margin of subsequent rib



Internal intercostals
Action - Compresses ribs at exhalation

Origin - Superior margin of subsequent rib

Insertion - Inferior margin of previous rib



Internal oblique
Action - Compresses abdomen

Origin - Iliac crest, inguinal ligament, & lumbar fascia

Insertion - ribs 8-10, linea alba, & xiphoid process

Grain - //\\\\





Transverse abdominis
Action - Compresses abdomen

Origin - Lumbar fascia, inguinal ligament

Insertion - Linea alba & pubis

Gran - == ==





Rectus abdominis
Action - Flexes vertebral column

Origin - Pubis

Insertion - Xiphoid process, ribs 5-7

Grain - ||





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