Anatomy - classification of spinal nerves .pptx

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 neuroscienceMizan

3. Spinal Nerve • • 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. • •

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 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. • • • 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. •

8. Spinal Nerves

9. Spinal Nerves Cervical spinal nerves • • • 8 Pairs 1 st 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 • •

10. Cervical Spinal Nerves

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

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

13. Sacral and Coccyx Spinal Nerve • • 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 . • • Spinal Nerves