Chapter 10
The Muscular System
357
10
MUSCLE
DESCRIPTION
ORIGIN (O) AND
INSERTION (I)
ACTION
NERVE
SUPPLY
Extensor indicis
(in
9
dı˘-kis)
(
indicis
5
index finger)
Tiny muscle arising close
to wrist
O—posterior surface of
distal ulna; interosseous
membrane
I—extensor expansion
of index finger; joins
tendon of extensor
digitorum
Extends index finger
and
assists in extending wrist
Posterior interosseous
nerve
MUSCLE GALLERY
Table 10.11
(continued)
Insertion of
triceps brachii
Anconeus
Flexor carpi ulnaris
Extensor carpi
ulnaris
Extensor digiti minimi
Extensor indicis
Tendons of extensor
carpi radialis brevis
and longus
Extensor expansion
(a)
Extensor pollicis
longus
Extensor pollicis
brevis
Abductor
pollicis longus
Extensor digitorum
Extensor carpi
radialis brevis
Extensor carpi
radialis longus
Brachioradialis
Tendons of
extensor
digitorum
Olecranon of ulna
Interossei
Anconeus
Supinator
Abductor pollicis
longus
Extensor pollicis
longus
Extensor pollicis
brevis
Extensor indicis
(b)
Figure 10.17
Muscles of the posterior fascial compartment of the right forearm
acting on the wrist and fingers. (a)
Superficial muscles, posterior view. (For a related image,
see
A Brief Atlas of the Human Body
, Figure 37b.)
(b)
Deep posterior muscles, superficial
muscles removed. The interossei, the deepest layer of intrinsic hand muscles, are also illustrated.
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