This section is 5 mm. above the previous level. Within the tegmentum the massive decussation of the brachium conjunctivum (8) occupies a large area. The medial lemniscus (14) is more clearly seen on the right side. It lies close to the surface at this level and is crescent-shaped in cross section. The nucleus (13) of the trochlear nerve lies just above fibers of the medial longitudinal fasciculus (7). The cut passes through the inferior colliculi (11) which lie in the tectum of the mesencephalon. The lateral lemniscus (2, lower pointer) is lateral to and just beneath the nucleus of the inferior colliculus on either side. Some fibers of this bundle enter the colliculus; others ascend, as the inferior quadrigeminal brachium, to reach the medial geniculate body.