Nervous system - spinal nerves, Biology

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SPINAL NERVES

31 Pairs. Mixed type. Total weight 150 gms.
At the base of origin of spinal nerves gland of swammardon or calcarious ganglion is present.
Composed of medulated nerve fibres.
Classified into five groups -

1. Cervical - 8 pairs

2. Thoracic - 12 pairs

3. Lumber - 5 pairs

4. Sacral - 5 pairs

5. Coccygeal - 1 pair

Each spinal nerve is originated from spinal cord from dorsal root and ventral root.
In dorsal root, root ganglion is present. Both roots fuse in neural canal to form spinal nerve.
It comes out of vertebral column from inter vertebral foramen.
Out side vertebral column each spinal nerve is divided into three parts -

(i) Dorsal branch or Ramus dorsalis

(ii) Ventral branch or Ramus ventralis

(iii) Visceral branch or Ramus communicans

Dorsal branch to skin and muscle of dorsal side.
Ventral branch to skin & muslce of ventral side.
Visceral branch is attached to ganglions of A.N.S.
In rabbit 37 pairs spinal nerves present -

1. Cervical - 8 pairs

2. Thoracic - 12 pairs

3. Lumber - 7 pairs

4. Sacral - 4 pairs

5. Caudal - 6 pairs

In rabbit caudal nerves combine with filum terminalis to form cauda equina.

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