SPINAL CORD LOCAL EXCHANGE

Nervous System 2 b


Segments, regions, and data record




THE SPINAL CORD-Regional communication exchange, - and dual highway to the brain.

The spinal cord, extends from the brain stem within the cranium, and lies in the spinal canal in the vertebrae, till the first lumbar vertebra where the cord ends.

The grey matter is centrally placed, in the form of an H.
The limbs of the H towards the back contain the cells that receive sensory information.

The limbs of the H, in front, contain cells that send motor instruction, to the muscles.

The white matter, of connecting fibers, to and from the brain, is on the outside of this central H.

31 pairs of spinal nerves leave the spinal cord for distribution to the 31 segments of the body.
Thus there are nerves proceeding to the upper limbs, the trunk, and the lower limbs.

There are eight cervical nerves, twelve thoracic, five lumbar, five sacral, and one coccyx nerve.
The segmented distribution helps to identify the source, of incoming sensory information, and accurate direction of messages, for action to muscles of the Specific segment.

The spinal cord can act independent of the brain, and can initiate action on receiving a message.
These actions are called reflex action.
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