365 Ways #121–My aching back!

#121–The multifidus, a key member of the Inner Unit which usually protects a spinal joint, doesn’t activate properly when injured and quickly atrophies—as much as 25% in 24 hours—with the dysfunction continuing even after the symptoms of pain have disappeared. This occurs because, unlike many other muscles with polysegmental innervation, the multifidus has unisegmental innervation. It has no back up nerve to feed it in case of injury. If it shuts down, the part of the spine which it stabilizes is at the mercy of every impact force transmitted through the body.

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