The gray matter of the spinal cord segments is divided cytoarchitectonically into ten distinct laminae. The first five laminae (1-5) are sensory in function, while lamina 9 forms the motor portion of the grtay matter. The cross sectional areas of the ten laminae of the gray matter in the segments forming the cervical and lumbosacral enlargements of the spinal cord of Duck, pigeon and chicken were calculated and drawn using a Computer-digitizing Set with a special area-calc Program. The obtained results were statistically analysed. In chicken [running bird), the mean percentage of the Cross sectional area of the motor part represented by lamina 9 to the total Cross sectional area of the gray matter at the level of the lumbsacral enlargement is 33. 98% equal 1.36 times that at the level of the cervical enlargement (25.35%). On the other hand, the cross sectional area of lamina 9 in the cervical enlargement is 1.7 times that at the level of the lumbosacral enlargement in pigeon [flying bird) and 1.2 times in duck swimming bird depends on the motor area of the cervical and lumbosacral enlargements in locomotion. The mean percentage of the cross sectional area of the sensory part to the total cross sectional area of the gray matter at the level of the lumbosacral enlargement in pigeon is 1.4 times that at the level of the cervical enlargement. However, the mean percentage of the cross sectional areas of the sensory laminae in both enlargements in case of duck and chicken are nearly equal.