Spinal nerves

1. Spinal Nerve

2. Spinal Nerve
• Spinal nerve are the path of communication
between the spinal cord and the specific region
of the body
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3. Spinal Nerve
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They are 31 pairs
Spinal nerve follows the name of corresponding
vertebra column.
Consists of cervical spinal nerve, thoracic spinal
nerve, lumbar spinal nerve, sacral spinal nerve and
coccyx spinal nerve.
Emerge from spinal cord and through the
intervertebral foramina of vertebra.
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4. Spinal Nerve
• Spinal nerves:
1. 8 pairs of cervical spinal
nerves
2. 12 pairs of thoracic spinal
nerves
3. 5 pairs of lumbar spinal
nerves.
4. 5 pairs of sacral spinal nerves
5. 1 pairs of coccyx spinal
nerves.

5. Spinal Nerve
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• Cervical and thoracic spinal nerves arise and leave at
corresponding vertebra .
Because the spinal cord are shorter than vertebra
column, nerve that arise from lumbar, sacral and
coccyx region of spinal cord do not leave the
vertebra column at the same level where they exit the
cord.
The root of these spinal nerves angle inferiorly in the
vertebral canal from the end of spinal cord like wisps
of hair.

6. Spinal Nerves

7. • These root of this nerve, collectively called cauda
equina.
Typical spinal nerve has 2 connection to spinal cord;
posterior / dorsal and anterior/ ventral root.
Posterior and anterior root unite to form spinal nerve at
intervertebral foramina.
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• Since posterior root contain sensory axons and
anterior root contain motor axons, spinal nerves is
classified as a mixed nerve.
Posterior root contain posterior root ganglion which
cell bodies of sensory neuron is located.
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8. Spinal Nerves

11. Spinal Nerves
Cervical spinal nerves
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8 Pairs
1st pair emerge between atlas and occipital bone
The remaining emerge from the vertebral column
through intervertebral foramina.
Spinal nerves C1 – C7 exits the vertebral canal
above their corresponding vertebra.
Spinal nerve C8 exits vertebral canal between C7
and T1
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12. Cervical Spinal Nerves

13. Thoracic spinal nerve
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12 pairs
Exits the vertebral canal below their corresponding
vertebra.
Emerge from thoracic vertebra
Continuous to form intercostals nerves.
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Spinal Nerves

14. Lumbar Spinal Nerve
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5 pairs
Emerge from lumbar vertebra.
Exits the vertebral canal below their corresponding
vertebra.
Spinal Nerves

15. Sacral and Coccyx Spinal Nerve
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5 pairs
From the spinal cord, the root of the sacral spinal
nerve enter the sacral canal (part of the vertebral
canal).
Sacral nerves (S1-S4) exits the vertebral canal via 4
pairs of anterior and posterior sacral foramen.
Spinal nerves S5 and Co1 exits from sacral hiatus.
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Spinal Nerves