SPINAL CORD QUICK RESPONSE

NERVOUS SYSTEM 2c

Spinal Cord


Quick response=Local reflex action.





WHAT ARE REFLEXES? Regional exchange in action
Some message received require urgent action, (like touching a hot object) these messages require urgent reaction, (removing hand from the object)
This instruction,is given by the spinal cord, (without waiting for brain reaction) these are reflex actions.

Babies have a similar gripping reflex, If you put any thing in their hand, they grip it. They are born with this reflex.

The knee jerk reflex, is the one most often tested, when you visit a doctor, it is a test of good function, of your central nervous system.

What is the cord made of?
Spinal Signals The up/down dual signal carriageway to the brain-
The spinal cord, is made of white matter, the long fibers, of nerve cells; and grey matter which is made of cell bodies.
- Nerve signals can only travel one way along a nerve fiber, so some nerve fibers carry signals down to the spine (the descending pathway) and some carry them up to the brain (the ascending pathway).

- An adult’s spinal cord is 43cm long and 2cm thick. It stops growing when you are four or five years old.

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