Superficial Back Muscles
Deep back muscles
Chest muscles
Abdominal muscles
Origins, insertions, and actions
100
Name the muscle highlighted
Latissimus dorsi
100
Serratus posterior
100
Pectoralis major
100
Rectus abdominis
100
Origin - Infraspinous fossa of the scapula
Insertion - Greater tubercle of the humerus
Action - Lateral rotation of humerus
Infraspinatus
200
Name the highlighted muscle
Deltoid
200
Teres major and Teres minor
200
Pectoralis minor
200
Internal oblique
200
Origin - Posterior surface of scapula at inferior angle
Insertion - Crest of lesser tubercle on anterior humerus
Action - Extends, adducts, medially rotates arm
Teres major
300
Name the highlighted muscle
Trapezius
300
Rhomboid major and Rhomboid minor
300
Serratus anterior
300
Psoas major and Psoas minor
300
Origin - Supraspinous fossa
Insertion - Humerus (greater tubercle)
Action - Stabilizes arm, assists in abduction of the arm
Supraspinatus
400
Origin - Spinous processes of T6-L5 vertebrae, Sacrum, and lliac crest
Insertion - Interubercular groove and medial aspect of humerus
Action - Adduction, medial rotation and extension of humerus
Origin, insertion, and action of Latissimus dorsi
400
Infraspinatus
400
External intercostals
400
Iliacus
400
Origin - Pubis crest and pubic symphysis
Insertion - Xiphoid process and cartilage of inferior ribs 5-7
Action - Flexes trunk, and compresses abdomen
Rectus abdominis
500
Origin - Lateral clavicle, acromion and spine of scapula
Insertion - Deltoid tuberosity of humerus
Action - Anterior fibers: flexion and medial rotation of arm
Middle fibers: abducts arm
Posterior fibers: Extension and lateral rotation of arm
Origin, insertion, and action of Deltoid
500
Erector Spinae
500
Internal intercostals
500
External oblique
500
Origin - Lateral surface of ribs 1-8
Insertion - Vertebral border of anterior scapula
Action - Pulls the scapula anteriorly and rotates it laterally
Serratus anterior
600
Origin - Occipital bone, spinous processed of C7-T12 vertebrae, the nuchal ligament
Insertion - Acromion and spine of scapula, lateral clavicle
Action - Superior fibers: elevated and superiorly rotate the scapula
Middle fibers: pull the scapula medial - adduct scapula
Inferior fibers - Depress the scapula
Origin, insertion, and action of Trapezius
600
Subscapularis and Supraspinatus
600
Origin - Lateran surface of ribs 1-8
Insertion - Vertebral border of anterior scapula
Action - Pulls the scapula anteriorly and rotates it laterally
Origin, insertion, and action of Serratus interior
600
Transverse (transversus) abdominis
600
Origin - Subscapular fossa
Insertion - Lesser tubercle of humerus
Action - Medially rotates arm
Subscapularis