Reflex Hammers

Nerve system may check and measure by many manners.Such as knock at knee o elbow using a small Reflex Hammer. Reflex function may help us differentiate all kinds of nerve function obstruction. Between our brain and spinal cord,nerve fiber is bundle by an insulation layer which is called marrow sheath and can conduct eletricity signal. Thanks to those fat outer scabbard,nerve impulse can jump from one desultory pause dot to another. By the way,signal can transfer apace.