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.
region of the brain is depicted below in the coronal sections
of one manatee, #85-32, which extends from the caudal part of
the thalamus down to the rostral portion of the spinal cord (that
is, the first cervical spinal segment within the vertebrae of
the upper neck.
brainstem images through the brainstem are arranged in four successive
pages from rostral to caudal: