brainstem consists of the entire caudal region of the
brain beneath the cerebellum, behind the thalamus, and
in front of the spinal cord. It is the huge stalk of the
brain which contains all the sensory, motor and interconnecting
cellular groups, together with all the fiber tracts which
pass through this region. The fiber tracts that interconnect
the forebrain (thalamus, basal forebrain, and cerebral
cortex), spinal cord, and cerebellum.