Parasympathetic Neurons is an important component in the neurobiology of neurodegenerative diseases. This page provides detailed information about its structure, function, and role in disease processes.
Parasympathetic neurons are part of the autonomic nervous system that controls involuntary functions. They are primarily involved in rest-and-digest activities, opposite to the sympathetic fight-or-flight response. These neurons are affected in various neurodegenerative diseases.
¶ Location and Anatomy
Parasympathetic neurons are found in:
- Brainstem nuclei (cranial nerves III, VII, IX, X)
- Sacral spinal cord (S2-S4)
- Peripheral ganglia near target organs
They have preganglionic neurons in the brainstem/sacral spinal cord and postganglionic neurons in peripheral ganglia close to effectors.
- Oculomotor (Edinger-Westphal nucleus): pupil constriction, accommodation
- Facial (superior salvatory nucleus): lacrimation, salivation
- Glossopharyngeal (inferior salvatory nucleus): parotid salivation
- Vagus (dorsal motor nucleus): visceral organ control
- Pelvic nerves: bladder, colon, reproductive organs
Enzyme synthesizing acetylcholine; definitive cholinergic marker.
Transports ACh into synaptic vesicles.
Co-transmitter in some parasympathetic neurons.
Neuropeptide in parasympathetic neurons.
¶ Rest and Digest
- Slow heart rate
- Increase digestive activity
- Constrict pupils
- Stimulate salivation and digestion
- Empty bladder and bowel
- Regulate organ function
- Maintain homeostasis
- Coordinate eating, urination, defecation
- Autonomic dysfunction common
- Parasympathetic denervation
- Constipation, urinary problems
- Orthostatic hypotension
- Severe autonomic failure
- Parasympathetic neuron degeneration
- Orthostatic hypotension, urinary dysfunction
- Selective parasympathetic failure
- Severe autonomic dysfunction
- Autonomic dysregulation
- Parasympathetic decline
- Cardiovascular dysregulation
- Singer C, et al. (1997). Autonomic dysfunction in Parkinson disease. Neurology, 49(5): 1188-1194. DOI:10.1212/WNL.49.5.1188
- Kaufmann H, et al. (2004). Natural history of pure autonomic failure: a United States prospective study. Annals of Neurology, 55(4): 513-518. DOI:10.1002/ana.20061
The study of Parasympathetic Neurons has evolved significantly over the past decades. Research in this area has revealed important insights into the underlying mechanisms of neurodegeneration and continues to drive therapeutic development.
Historical context and key discoveries in this field have shaped our current understanding and will continue to guide future research directions.
- Furness JB, et al. (2014). The enteric nervous system and gastrointestinal innervation. Nature Reviews Gastroenterology & Hepatology, 11(5): 286-294. DOI:10.1038/nrgastro.2014.32
- De Giorgio R, et al. (2012). Enteric neuropathology: recent advances. Journal of Pathology, 226(2): 145-149. DOI:10.1002/path.2987
- Browning KN, et al. (2015). Vagal neurocircuits controlling gastrointestinal motility. Autonomic Neuroscience, 192: 41-49. DOI:10.1016/j.autneu.2015.08.005
- Powley TL, et al. (2008). Vagal innervation of the digestive tract. Neurogastroenterology & Motility, 20(s1): 1-12. DOI:10.1111/j.1365-2982.2008.01100.x