Sensation to the little finger is supplied by the ulnar nerve which runs from spinal column along the inside of the arm to the little finger. In the region of the elbow it travels in a tunnel close to the surface. This tunnel is called the cubital tunnel. When one accidentally hits the elbow & feels tingling in the fingers commonly known as striking ones funny bone it is because the nerve in this tunnel has been hit. When the elbow is extended straight out the tunnel is at it’s maximum diameter. As the elbow is flexed the tunnel is narrowed & the nerve squashed to some degree. Many people sleep with their elbows flexed possibly due to this being part of the fetal position assumed in utero. Cubital tunnel syndrome is the name given to symptoms that occur from chronic compression of the nerve in the cubital tunnel-numbness of the ring & small finger, wasting away of muscles in the hand & weakened grip strength. If left to progress irreparable nerve damage can occur. In some cases all that is required is the wearing of an elbow splint to prevent flexion while sleeping. More severe cases require surgical decompression of the tunnel. Also see Nerve Compression.