Autonomic Nervous System:The part of the nervous system responsible for control of bodily functions not consciously directed, such as breathing, heartbeat, and digestive processes.
Parasympathetic Nervous System:A division of the autonomic nervous system that conserves energy by slowing down heart rate, increasing intestinal and gland activity, and relaxing sphincter muscles in the gastrointestinal tract.
Cranial Nerves:Twelve pairs of nerves that originate directly from the brain (not through spinal segments) which primarily serve motor or sensory functions related to eyesight, smell, taste, hearing, balance, speech, facial sensations and movements