418
UNIT THREE
Cervical
nerves
Thoracic
nerves
Lumbar
nerves
Sacral
nerves
Coccygeal
nerve
view
Cauda equina
Posterior
C1
C2
C3
C4
C5
C6
C7
C8
T1
T2
T3
T4
T5
T6
T7
T8
T9
T10
T11
T12
L1
L2
L3
L4
L5
S2
S3
S4
S1
S5
Co
FIGURE 11.29
The thirty-one pairs of spinal nerves are grouped according to the level from which they arise and are numbered in sequence.
the intervertebral foramen, is associated with the verte-
bra above it. The cervical spinal nerves are an exception
because spinal nerve C1 passes superior to the vertebra C1.
Thus, though there are seven cervical vertebrae, there are
eight pairs of
cervical nerves
(numbered C1 to C8). There are
twelve pairs of
thoracic nerves
(numbered T1 to T12), F
ve
Spinal nerves are not named individually but are grouped
by the level from which they arise. Each nerve is numbered
in sequence
(fig. 11.29)
. On each vertebra the vertebral
notches, the major parts of the intervertebral foramina, are
associated with the inferior portion of their respective verte-
brae. ┬▒or this reason, each spinal nerve, as it passes through
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