answers: brain stem
context: main cortical tracts - contain tracts from the internal capsule. The portion of the lobes in connection with the tegmentum, except the most lateral portion, is dominated by a blackened band - the substantia nigra (literally "black substance") - which is the only part of the basal ganglia system outside the forebrain. It is ventrally wider at the rostral end. By means of the basal ganglia, the substantia nigra is involved in motor-planning, learning, addiction, and other functions. There are two regions within the substantia nigra - one where neurons are densely packed (the pars compacta) and one where they </s> cortex, which forms a representational map of the body. A "motor" homunculus represents a map of brain areas dedicated to "motor" processing for different anatomical divisions of the body. The primary motor cortex is located in the precentral gyrus, and handles signals coming from the premotor area of the frontal lobes. A "sensory" homunculus represents a map of brain areas dedicated to "sensory" processing for different anatomical divisions of the body. The primary sensory cortex is located in the postcentral gyrus, and handles signals coming from the thalamus. These signals are transmitted on from the gyri to the brain stem </s> Lateral to the sulcus limitans is the area of the vestibular system, which is involved in special sensation. Moving rostrally, the inferior, middle, and superior cerebellar peduncles are found connecting the midbrain to the cerebellum. Directly rostral to the superior cerebellar peduncle, there is the superior medullary velum and then the two trochlear nerves. This marks the end of the pons as the inferior colliculus is directly rostral and marks the caudal midbrain. Middle cerebellar peduncle is located inferior and lateral to the superior cerebellar peduncle, connecting pons to the cerebellum. Likewise, inferior cerebellar peduncle is found connecting the medulla
question: the midbrain pons and medulla oblongata are all part of the