When spinal cord injuries interrupts descending motor tracts...?

Question

When descending motor tracts are interrupted by a spinal cord injury, how would a person have muscle spasms below the level of injury? The answer lies in the muscle stretch pathway...

Answer 1

Think about how your knee jumps when a doctor hits it with the mallet. Its a closed loop. It never goes back up the spinal cord. In other words - it activates the stretch receptors.

Answer 2

well i think that the INHIBITORYsignals cumin from the level above the lesion are blocked... so therefore there is resultant MUSCLE SPASM!!!!