Shoulder, and Upper Limb

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 b. Coracobrachialis

rotates arm medially

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 scapulag. Infraspinatus

___ 7. Turns forearm laterally h. Pectoralis major

___ 8.Depress and protract shoulderi. 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 mediallyn. Teres major

___13. Extends and adducts hand at the wrist o. Triceps brachii

_____14. Rotates arm laterally(2 answers)p. Latissimusdorsi

___15. Flexes distal joints of fingers

Part B

Name the muscle indicated by the following combinations of origin and insertion.

Origin Insertion Muscle

1. Transverse process of first cervical vertebrae / 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 / Olecranon of ulna
9. Medial epicondyle of humerus
and coronoid process of ulna / Lateral surface of radius
10. Medial surface of distal ulna / Anterior and lateral surface of radius
11. Lateral epicondyle of humerus / Anterior and 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