Muscles That Move The Arm

Question 1

What is the origin, insertion and action for the Latissimus Dorsi?

Answer 1

O: T7-T12, iliac crest, thoracolumbar fascia
I: intertubercular groove of humerus
A: extends, adducts, and medially rotates arm

Question 2

What is the origin, insertion and action for the pectoralis Major?

Answer 2

O: clavicular head, sternal head
I: greater tubercle, intertubercular groove
A: flexes, adducts, and medically rotates arm

Question 3

What is the origin, insertion and action for the Deltoid?

Answer 3

O: clavicle, acromion, and spine of scapula
I: deltoid tuberosity
A: flexes, abducts, and extends

Question 4

What is the origin, insertion and action for the Coracobrachialis?

Answer 4

O: coracoid process
I: shaft of humerus
A: adducts, and flexes arm

Question 5

What is the origin, insertion and action for the Teres Major?

Answer 5

O: lateral border and inferior angle of scapula
I: lesser tubercle & intertubercular groove
A: extends, adducts, and medially rotate arm