Sympathetic Ganglia – These are the ganglia of the sympathetic nervous system. They are scattered along the sympathetic chain (paravertebral ganglia) and the abdominal plexus (prevertebral ganglia). They bring information from the brain to the body regarding perceptions of danger.
Cerebellum – The cerebellum does look like a miniature version of the brain as it protrudes from under the posterior and inferior region of the cerebral cortex. Although the cerebellum has many functions, it is primarily associated with movement. Specifically, it seems to be involved with facilitating movement by detecting errors that occur in the course of a movement and correcting them, so the movement appears fluid and achieves its intended goal. The cerebellum is also involved with motor learning to reduce the likelihood errors in movement will occur again in the future.
Nerve fibers – These may be present in unifascicular or multifascicular peripheral nerve trunks or in central nervous tracts, which help to send signals to and from the brain.