The red nucleus, maintaining connections with the cerebrum and cerebellum, is associated with motor coordination, e.g., the red nucleus facilitates flexor movements in the contralateral upper limb via the rubrospinal tract. The superior colliculi are involved with visual reflexes and the inferior colliculi are involved in auditory relays. The body must control what kinds and what amounts of movements. The internal capsule is a region lateral to the thalamus where descending and ascending tracts traverse near to each other. Dark because of melanin deposition.
Neurons here contain dopamine.
D 1 receptors are excitatory, D 2 receptors are inhibitory. Seen in unilateral optic nerve damage. Accomodation involves the occipital cortex projecting onto the structures mentioned above. In conjugate gaze , typically the eyes work in tandem in looking at an object. The ocular appearance of nystagmus occurs because of the vestibular tract tie-ins to ocular systems, e.g.,the MLF just mentioned.