Ventral primary rami:

contain motor, efferent fibers only.
contain both afferent and efferent fibers that supply the deep back muscles and the skin over the back.
contain both afferent and efferent fibers that supply the limbs and the front and sides of the trunk.
contain sensory, afferent fibers only.
are located next to the spinal nerves, proximal to the spinal cord.