Neuronal Signaling and the Structure of the Nervous System
179
Figure 6–42
Dorsal view of the spinal cord and spinal nerves. Parts of the skull and vertebrae have been cut away; the ventral roots of the spinal nerves are
not visible. In general, the eight cervical nerves (C) control the muscles and glands and receive sensory input from the neck, shoulders, arms,
and hands. The 12 thoracic nerves (T) are associated with the shoulders, chest, and upper abdomen. The fi ve lumbar nerves (L) are associated
with the lower abdomen, hips and legs, and the fi ve sacral nerves (S) are associated with the genitals and lower digestive tract.
Redrawn from FUNDAMENTAL NEUROANATOMY by Walle J. H. Nauta and Michael Fiertag. Copyright © 1986 by W. H. Freeman and Company. Reprinted by permission.
S5
CO1
S1
L5
L1
T12
T1
C8
C1
Sciatic
nerve
Pelvis
Cutaway of
vertebra
12th rib
Dorsal root
ganglion
Skull
Ribs
Scapula
Sacrum
Coccyx
(tailbone)
previous page 207 Vander's Human Physiology The Mechanisms of Body Function read online next page 209 Vander's Human Physiology The Mechanisms of Body Function read online Home Toggle text on/off