421
CHAPTER ELEVEN
Nervous System II
3. The
lower subscapular nerve
supplies the subscapularis
and teres major muscles.
4. The
thoracodorsal nerve
supplies the latissimus dorsi
muscle.
5. The
suprascapular nerve
supplies the supraspinatus and
infraspinatus muscles.
Lumbosacral Plexuses
The
lumbosacral
(lum
bo-sa
kral)
plexuses
are formed by
the last thoracic nerve and the lumbar, sacral, and coccy-
geal nerves. These networks of nerve F
bers extend from the
4.
Radial nerves
supply muscles of the arms on the
posterior sides and the skin of the forearms and hands.
5.
Axillary nerves
supply muscles and skin of the anterior,
lateral, and posterior regions of the arm.
Other nerves associated with the brachial plexus that
innervate various skeletal muscles include the following:
1. The
lateral
and
medial pectoral nerves
supply the
pectoralis major and pectoralis minor muscles.
2. The
dorsal scapular nerve
supplies the rhomboid major
and levator scapulae muscles.
C1
C2
C3
C4
C5
C6
C7
C8
T1
T2
T3
T4
T5
T6
T8
T9
T10
T11
T12
L1
L2
L3
L4
L5
S2
S3
S4
S5
Co
Posterior view
Cervical plexus
(C1–C4)
Intercostal
nerves
Lumbosacral plexus
(T12–S5)
Sciatic nerve
Brachial plexus
(C5–T1)
Obturator nerve
Femoral
nerve
Phrenic nerve
Ulnar nerve
Median nerve
Radial nerve
Axillary nerve
Musculocutaneous
nerve
T7
S1
Cauda equina
FIGURE 11.32
The ventral branches of the spinal nerves in the thoracic region give rise to intercostal nerves. Those in other regions combine to
form complex networks called plexuses.
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