A vertebral clamp adapted to control the spatial relationship between two vertebrae by attachment to the laminae thereof. The vertebral clamp includes a longitudinally extending body divided into first and second halves. The halves are fastened together by fastening means that allow for adjustment of the length of the body. Two laminar clamps are attached to the body, one at each end thereof. Each laminar clamp is adapted to rigidly and securely clamp from opposed sides to a lamina of one of the vertebrae with the other laminar clamp similarly clamped to a lamina of the other vertebra.