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.
Cause of Pins and Needles. The feeling of pins and needles is known as paresthesia.. Most people associate it with sleeping incorrectly on a nerve. This causes the nerve to stop sending signals so that it falls asleep and creates a feeling of numbness. When pressure is taken off of the nerve, the body sends shock waves down the nerve to wake it up. This is what creates a feeling of pins and needles.