Dorsal view of sheep brain with the cerebellum and caudal cerebrum removed. The
rostral colliculus (large arrow label) and the
caudal colliculus (small arrow label) together form the
tectum of the midbrain.
Also labeled are the pineal body (green), the caudate nucleus (1), the floor of the fourth ventricle (white and pink) and cerebellar peduncles (blue = rostral, red = middle, and yellow = caudal).