The Superior Colliculus is extremely important in controlling eye-head movements in orienting to a variety of stimuli. Its output pathway, the Tectospinal Tract, has been located on many previous sections.
The Brachium of the Inferior Colliculus projects from the Inferior Colliculus to the Medial Geniculate Body of the Thalamus located more rostrally..
The Crus Cerebri can be divided into thirds such that the medial 1/3 contains the frontopontine fibers, the middle 1/3 contains the corticobulbar and corticospinal fibers, and the lateral 1/3 contains the parietopontine, occipitopontine, and temporopontine fibers.
The Substantia Nigra (SN) is a component of the Basal Ganglia and provides the dopaminergic innervation of the Caudate and Putamen that is deficient in Parkinson's Disease.
The Superior Cerebellar Peduncles have finished decussating and are continuing on their course to more rostral structures such as the red nucleus and ventrolateral nucleus of the thalamu (VL).
The Cerebral Peduncle includes both the Crus Cerebri and the Substantia Nigra.