Chapter 10
The Muscular System
359
10
Triceps
brachii
Others
Lateral
head
Humerus
Posterior compartment of arm
(extends elbow); innervated by
radial nerve
Anterior compartment of arm
(flexes elbow); innervated by
musculocutaneous nerve
Anterior compartment of forearm
(flexes wrist and fingers);
innervated by median or ulnar nerve
Posterior compartment of forearm
(extends wrist and fingers);
innervated by radial nerve
Long
head
Medial
head
(a)
(b)
Brachialis
Short head
Long head
Biceps brachii
Flexors
Extensors
Radius
Pronator teres
Brachioradialis
(elbow flexor)
Abductor
pollicis
longus
Ulna
(b) Muscles of the forearm
(a) Muscles of the arm
Extensors
Flexors
Others
Key:
MUSCLE GALLERY
Table 10.12
(continued)
Figure 10.18
Summary: Actions of muscles of the arm and
forearm.
previous page 393 Human Anatomy and Physiology (9th ed ) 2012 read online next page 395 Human Anatomy and Physiology (9th ed ) 2012 read online Home Toggle text on/off