Origin, Insertion, and Function of Human Arm Muscles

Question 1

Pectoralis major

Answer 1

Origin: Clavicle, sternum

Insertion: humerus

Function: arm flexion

Question 2

Pectoralis minor

Answer 2

Origin: Anterior surface of ribs 3–5

Insertion: Coracoid process of scapula

Function: moves rib cage superiorly

Question 3

Deltoid

Answer 3

Origin: spine of scapula

Insertion: Deltoid tuberosity of
humerus

Function: arm abduction

Question 4

Latissimus dorsi

Answer 4

Origin: iliac crest

Insertion: Floor of
intertubercular sulcus of humerus

Function: arm extension

Question 5

Infraspinatus

Answer 5

Origin: Infraspinous fossa of
scapula

Insertion: Greater tubercle of
humerus

Function: Lateral rotation of arm

Question 6

Teres minor

Answer 6

Origin: Lateral margin of
posterior scapula

Insertion: Greater tubercle of
humerus

Function: Lateral rotation of arm

Question 7

Teres major

Answer 7

Origin: Posterior surface at
inferior angle of scapula

Insertion: Intertubercular sulcus of humerus

Function: adducts arm

Question 8

Supraspinatus

Answer 8

Origin: Supraspinous fossa of
scapula

Insertion: Greater tubercle of
humerus

Function: adduction of the arm