Name:
Muscles of the Chest,
Shoulder, and Upper Limb
Laboratory Exercise 21
Background
The muscles of the chest and shoulder are responsible for moving the scapula and
arm, whereas those within the arm and forearm move joints in the elbow and hand.
Materials Needed
Textbook
Articulated skeleton
Muscular model of the upper limb
Purpose of the Exercise
Review the locations, actions, origins, and insertions of the muscles in the chest,
shoulder, and upper limb.
Procedure
1. Label figures 21.1, 21.2, 21.3, 21.4, and 21.5.
2. Try to locate the muscles, labeled in the diagrams, in your own body:
3. Demonstrate the action of these muscles in your own body.
4. Locate the origins and insertions of these muscles in the human skeleton.
5. Complete Parts A and B.
Figure 21.1 Label the muscles of the posterior shoulder.
Figure 21.2 Label the muscles of the anterior chest.
Figure 21.3 Label the muscles of the posterior shoulder and arm and the muscles
of the anterior shoulder and arm.
Figure 21.4 Label the muscles of the anterior forearm and the muscles of the
posterior forearm.
Part A
Match the muscles in column B with the actions in column A. Place the letter of your
choice in the space provided.
Column A
Column B
___ 1. Abducts Arm
a. Brachialis
___ 2. Pulls arm forward and across chest and
rotates arm medially
b. Coracobrachialis
c. Deltoid
___ 3. Flexes and adducts hand at the wrist
d. Extensor carpi ulnaris
___ 4. Rotate and adducts scapula
e. Flexor carpi ulnaris
___ 5. Rotates forearm medially
f. Flexor digitorum
___ 6. Protracts shoulder, abducts and medially
Rotates scapula
g. Infraspinatus
___ 7. Turns forearm laterally
h. Pectoralis major
___ 8. Depress and protract shoulder
i. Pectoralis minor
j. Pronator teres
___ 9. Flexes the forearm at the elbow
k. Rhomboid muscles
___10. Flexes and adducts arm at the shoulder
along with pectoralis major
l. Serratus anterior
___11. Extends the forearm at the elbow
m. Supinator
___12. Extends, adducts, and rotates arm medially
n. Teres major
___13. Extends and adducts hand at the wrist
o. Triceps brachii
_____14. Rotates arm laterally (2 answers)
p. Latissimus dorsi
___15. Flexes distal joints of fingers
Part B
Name the muscle indicated by the following combinations of origin and insertion.
Origin
Insertion
1. Transverse process of first
cervical vertebrae
Muscle
Vertebral border of scapula
2. Anterior surfaces of upper
ribs
Coracoid process of scapula
3. Anterior margins of ribs 1-9
Anterior surface of medial border
of scapula
4. Coracoid process of scapula
Medial shaft of humerus
5. Lateral border of scapula
Greater tubercle of
humerus
6. Subscapular fossa of scapula
Lesser tubercle of humerus
7. Inferior angle of scapula
Intertubercular groove
8. Anterior distal surface of
humerus
9. Medial epicondyle of humerus
and coronoid process of ulna
Olecranon of ulna
10. Medial surface of distal ulna
Anterior and lateral surface of
radius
Anterior and lateral surface of
radius
11. Lateral epicondyle of
humerus
Lateral surface of radius
12. Medial epicondyle of humerus
Base of second and third
metacarpals
13. Medial epicondyle of humerus
Tendinous sheet of palm
14. Distal lateral surface of
humerus
Base of second and third
metacarpal
15. Lateral epicondyle of
humerus
Base of fifth metacarpal