The vertebral axis is only one direction, and our bodies have two additional directions: front to back, and side to side. The terms for the front to back direction are: Anterior: Toward the front. The nose is on the anterior side of the head. Posterior: Toward the rear.
If you're experiencing numb fingers, especially in the left hand pinky and ring fingers, the most likely cause is ulnar nerve compression or entrapment. The ulnar nerve runs from the spine, past the shoulder blades, down the arm, across the outer bend of the elbow and down the arm to the pinky and ring fingers.
Numb's the Word - It's Not Always Carpal Tunnel Syndrome. Most people assume numbness or tingling in their fingers means they have carpal tunnel syndrome -- but that is not always the case. If your symptoms include a loss of sensation in half of your ring finger and all of little finger, you most likely have cubital tunnel syndrome.