358
UNIT 2
Covering, Support, and Movement of the Body
10
MUSCLE GALLERY
Table 10.12
Summary: Actions of Muscles Acting on the Arm, Forearm, and Hand
(Figure 10.18)
PART I:
Muscles Acting on
the Arm (Humerus)
(PM
5
Prime Mover)
 
Actions at the Shoulder
Flexion
Extension
Abduction
Adduction
Medial
Rotation
Lateral
Rotation
Pectoralis major
3
(PM)
 
 
3
(PM)
3
 
Latissimus dorsi
 
3
(PM)
 
3
(PM)
3
 
Teres major
 
3
 
3
3
 
Deltoid
3
(PM)
(anterior fibers)
3
(PM)
(posterior fibers)
3
(PM)
 
3
(anterior fibers)
3
(posterior fibers)
Subscapularis
 
 
 
 
3
(PM)
 
Supraspinatus
 
 
3
 
 
 
Infraspinatus
 
 
 
 
 
3
(PM)
Teres minor
 
 
 
3
(weak)
 
3
(PM)
Coracobrachialis
3
 
 
3
 
 
Biceps brachii
3
(weak)
 
 
 
 
 
Triceps brachii
 
 
 
3
 
 
PART III:
Muscles Acting on
the Wrist and Fingers
 
Actions on the Wrist
Actions on the Fingers
Flexion
Extension
Abduction
Adduction
Flexion
Extension
Anterior Compartment
 
 
 
 
 
 
Flexor carpi radialis
3
(PM)
 
3
 
 
 
Palmaris longus
3
(weak)
 
 
 
 
 
Flexor carpi ulnaris
3
(PM)
 
 
3
 
 
Flexor digitorum
superficialis
3
(PM)
 
 
 
3
 
Flexor pollicis longus
 
 
 
 
3
(thumb)
 
Flexor digitorum
profundus
3
 
 
 
3
 
Posterior Compartment
 
 
 
 
 
 
Extensor carpi radialis
longus and brevis
 
3
3
 
 
 
Extensor digitorum
 
3
(PM)
 
 
 
3
(and abducts)
Extensor carpi ulnaris
 
3
 
3
 
 
Abductor pollicis longus
 
 
3
 
(abducts thumb)
Extensor pollicis longus
and brevis
 
 
 
 
 
3
(thumb)
Extensor indicis
 
3
(weak)
 
 
 
3
(index finger)
PART II:
Muscles Acting
on the Forearm
 
Actions on the Forearm
Elbow Flexion
Elbow Extension
Pronation
Supination
Biceps brachii
3
(PM)
 
 
3
Brachialis
3
(PM)
 
 
 
Triceps brachii
 
3
(PM)
 
 
Anconeus
 
3
 
 
Pronator teres
3
(weak)
 
3
 
Pronator quadratus
 
 
3
(PM)
 
Supinator
 
 
 
3
Brachioradialis
3
 
 
 
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