Primary motor area of brain is supplied by

Greater pa of lateral surface receives supply from middle cerebral aery, whearas medial surface of cerebrum is majorly supplied by anterior cerebral aery The upper limb and head Are represented on the lateral surface of the coex in homunculus, whereas pelvis and lower limb are on the medial surface of the hemispheres. Therefore the motor and sensory functions of the lower limb are supplied by the anterior cerebral aery while the motor and sensory functions of the upper limb and head are supplied by the middle cerebral aery. Ref: Gray's 39e/p-227