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.
Finger numbness is an abnormal condition in which you feel a loss of sensation or tingling in your fingers. For instance, you may feel your fingers going numb after holding your arm in the same position for a long period of time. Finger numbness usually arises from a lack of blood supply to an area or damage to a nerve or nerves that supply the hand, such as in carpal tunnel syndrome or a cervical disk problem.