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Pectoralis major
- Origin: Ribs 3-5
- Insertion: Corocoid process of the scapula
- Action: Depresses scapula, downwardly rotates scapula
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External Intercostals
- Origin: Inferior border of the rib
- Insertion: Superior border of the rib
- Action: Elevates rib cage
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Internal intercostals
- Origin: Superior border of the ribs
- Insertion: Inferior boarder of the ribs
- Action: Depresses rib cage
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Serratus anterior
- Origin: Ribs 1-8
- Insertion: Vertibral border of the scapula
- Action: Rotates inferior agle os scapula laterally
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External obliques
- Origin: Ribs 5-12
- Insertion: Linea alba, pubic crest, pubis tubercle, iliac crest
- Action: Flexes vertibral column, compresses abdominal wall
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Internal obliques
- Origin: Lumbar fascia, iliac crest, inguinal ligament
- Insertion: Linea alba, pubic crest
- Action: Flexes vertibral column, compresses abdominal wall
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Rectus abdominus
- Origin: Pubic crest, pubic symphysis
- Insertion: Xiphoid process, ribs 5-7
- Action: Flexes lumbar region of vertibral column, rotates lumbar region of vertibral column
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Trapezius
- Origin: Occipital bone, spinous process of C7-T12
- Insertion: Lateral 1/3 of clavicle, spine of scapula, acromion process of scapula
- Action: Elevates scapula, depresses scapula, rotates scapula, adducts scapula
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Deltoid
- Origin: Lateral 1/3 of clavical, spine of scapula, acromion process of scapula
- Insertion: Deltoid tuberosity of the humerus
- Action: Abducts arm, flexes arm at shoulder, rotates arm medially, extends arm at shoulder, rotates arm laterally
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Latissimus dorsi
- Origin: Spinous process of T7-T12, ribs 9-12, iliac crest, inferior angle of scapula
- Insertion: Intertubercular groove of the humerous
- Action: Extends arm at shoulder, adducts arm, rotates arm medially
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Pectoalis major
- Origin: Sternal end of the clavicle, ribs 1-6
- Insertion: Greater tubercle of humerus
- Action: Flexes arm at shoulder, rotates arm medially, adducts arm
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Lavator scapula(e)
- Origin: Transverse processes of C1-C4
- Insertion: Vertebral border of the scapula
- Action: Elevates scapula, downwardly rotates scapula
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Rhomboid major
- Origin: Spinous process of T2-T5
- Insertion: Vertibral border of the scapula
- Action: Adducts scapula, downwardly rotates scapula
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Rhomboid minor
- Origin: Spinous processes of C7-T1
- Insertion: Vertibral border of the scapula
- Action: Adducts scapula, downwardly rotates scapula
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Supraspinatus
- Origin: Supraspinous fossa of the scapula
- Insertion: Greater tubricle of the humerus
- Action: Abducts arm
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Infraspinatus
- Origin: Infraspinous fossa of the scapula
- Insertion: Greater tubercle of the humerus
- Action: Rotates arm laterally
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Teres major
- Origin: Inferior angle of the scapula
- Insertion: Lesser tubercle of the humerous
- Action: Adducts arm, extends arm at shoulder, rotates arm medially
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Teres minor
- Origin: Lateral border of the scapula
- Insertion: Greater tubercle of humerus
- Action: Rotates arm laterally
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Subscapularis
- Origin: Subscapular fossa of the scapula
- Insertion: Lesser tubercle of the humerus
- Action: Rotates arm medially
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