between the second and third vertebrae and is intended to be smaller in size than the spacing to allow for flexion of the spinal column 18 the body portion 21 further includes a pair of oppositely positioned ears 30 extending laterally outwardly from the body portion in opposing directions each of the ears containing an aperture 32 structured and arranged to slideably receive one of the support members or guide rods 28 as will be discussed in greater detail below the second interlaminar member is movably supported by upwardly extending support members or guide rods and the position of the second interlaminar member 20 relative to the first interlaminar member 12 may be adjusted depending upon the dimensions of the specific spinal column on which the system is installed and the range of motion desired once the position of the second interlaminar member 20 has been selected it is locked in place by a pair of set screws or other suitable fastening means 34 extending through each of the ears 30 and adapted to releaseably engage the respective guide rod extending therethrough referring now to fig2 7 and 8 the first interlaminar member is 12 depicted in greater detail the first interlaminar member comprises a u shaped body 40 defined by an elastic midsection 42 two spaced apart end portions 44 and a pair of juxtaposed legs 46 each leg extending substantially parallel to one another from one of the respective ends in.