spinal nerve.pdf

Anatomy for BSc Nursing

1. Spinal Nerve

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Spinal Nerve
•Spinal nerve are the path of communication
between the spinal cord and the specific
region of the body

3. Spinal Nerve
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31 pairs
Spinal nerve follows the name of
corresponding vertebral column.
Consists cervical spinal nerve, thoracic
spinal nerve, lumbar spinal nerve, sacral
spinal nerve and coccyx spinal nerve.
Emerge from spinal cord and through the
inter-vertebral foramina of vertebra.
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4. Spinal Nerve
• Spinal nerves:
❑8 pairs of cervical spinal nerves
❑12 pairs of thoracic spinal
nerves
❑5 pairs of lumbar spinal nerves.
❑5 pairs of sacral spinal nerves
❑1 pairs of coccyx spinal nerves.

5. Spinal Nerve
•Cervical and thoracic spinal nerves arise and leave
at corresponding vertebra.
•Because the spinal cord are shorter than vertebral
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. •These root of these nerves, collectively called cauda
equina.
Typical spinal nerve has 2 connection to spinal cord;
posterior / dorsal and anterior/ ventral root.
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Since posterior root contain sensory axons and
anterior root contain motor axons, spinal nerves
is classified as a mixed nerve.

7. Spinal Nerves
Cervical spinal nerves
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8 Pairs
1
st
pair emerge between atlas and occipital bone
The remaining emerge from the vertebral
column through inter-vertebral 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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8. Cervical Spinal Nerves

9. Thoracic spinal nerve
•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

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

11. 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

12. Distribution of Spinal Nerve
Branches
•From the root, after passing the intervetebral foramen,
a spinal nerve divide into several branches.
Theses branches are call rami (ramus) ; posterior
(dorsal) ramus and anterior (ventral) ramus.
Posterior (dorsal) ramus serve the deep muscles and
skin of the posterior surface of the trunk.
Anterior (ventral) ramus serve muscles and structure
of the upper and lower limbs and the skin of the
lateral and anterior surface of the trunk.
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13. Plexuses
•Axons from the anterior (ventral)rami of spinal
nerves, except for the thoracic nerves T2-T12, do
not go directly to the body structures they supply.
They form network on both the left and right side of
the body by joining with various numbers of axons
from anterior rami of adjacent nerves.
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Distribution of Spinal Nerve

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Plexuses
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Network of axons is call plexuses.
The principle plexus:
•Cervical plexus
•Brachial plexus
•Lumbar plexus
•Sacral plexus
•Coccygeal plexus
Distribution of Spinal Nerve

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