Concerned with interhemispheric transfer of information. A compact bundle of myelinated fibers. Interconnects olfactory bulbs and the temporal cortices. Lesions in the optic chiasma result in a characteristic visual field loss known as bitemporal hemianopia. Contains corticospinal, corticobulbar, and corticopontine fibers.
Lesions result in contralateral weakness or paralysis, including the face.
A large nuclear mass in the ventral part of the-midbrain. Located dorsal to the cerebral peduncles. Melanin-containing neurons in this nucleus are connected with the basal ganglia and the thalamus. The substantia nigra is an important structure in the genesis of movement. Invariably the site of pathology in Parkinson's disease.