Variations of blood supply to primary motor area of human brain

Objectives: to add to existing knowledge in performing various techniques used in radiology and operations of this area. methods: one hundred cerebral hemispheres were obtained from cadavers and put in 10 percent formalin for one week so as to fix them. different coloured indian ink was injected by placing brannula in anterior cerebral artery,middle cerebral arteries and posterior cerebral arteries. measurements of length of each vessel was taken with electronic digital vernier caliper from origin to termination and mean length was calculated along with standard deviation. measurement of diameter of each vessel was measured by electronic digital vernior caliper at origin,middle and distal end. mean diameter was computed along with standard deviation for each vessel. results: the middle cerebral (mca) and anterior cerebral arteries (aca) are the major blood vessels supplying the primary motor area and the accessory middle cerebral artery is the collateral artery to this area. the posterior cerebral arteries (pca) were not noted in any case. variations of arteries supplying these major functional areas already mentioned were noted frequently. variations in appearance were noted as smooth and nodular. variations regarding course were noted as straight or tortuous. nodularity and tortuous course could explain the high incidence of cerebrovascular accidents.