Spinal Cord Injury 1

33 Vertebra:

31 Pairs of Spinal Nerves:

pathways going UP to the brain carrying sensory information

a neural pathway that controls ACTION reflex without input from the CNS

Most nerve impulses move up spinal cord to brain and back down thru spinal cord to peripheral nerves…however, some merely enter thru dorsal root of cord, synapse, and exit thru ventral root of cord. (ie. the knee jerk reflex)
-Intact cord have message sent to brain at same time
-Some SCI have reflexes without voluntary muscle control (UMN) and some don’t have any reflexes below level of injury (LMN)

an area of the skin supplied by nerves from a 
single spinal root.Each of these nerves relays 
sensation, including pain, from a particular region
 of the skin to the brain.

motor pathways delivering signal for movement/response to stimuli