Intrinsic Cardiac 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.
Intrinsic cardiac neurons (ICNs) are a population of neurons located within the heart itself that form the "little brain" of the heart. These neurons constitute the cardiac nervous system, which can operate independently of central nervous system input to modulate heart rate, contractility, and cardiac rhythm. While primarily studied in cardiovascular physiology, these neurons have emerging relevance to neurodegenerative diseases through autonomic dysfunction[1].
In neurodegeneration, particularly in Parkinson's disease and multiple system atrophy, cardiac autonomic dysfunction is a common non-motor symptom, reflecting pathology in both central and peripheral autonomic pathways including intrinsic cardiac neurons.
Intrinsic cardiac neurons are distributed throughout the heart:
ICNs exhibit varied morphology:
Intrinsic cardiac neurons use:
Key receptors include:
ICNs integrate multiple inputs[3]:
Functions include:
Vagal control of ICNs:
Sympathetic modulation:
Cardiac autonomic dysfunction in PD[4]:
In MSA:
DLB cardiac involvement:
Cardiac effects:
Cardiac pacing:
Autonomic modulation:
Emerging therapies:
The study of Intrinsic Cardiac 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.
Armour JA. Cardiac neuronal hierarchy in health and disease. Am J Physiol Regul Integr Comp Physiol. 2004;287(2):R262-R271. PMID: 15252983. ↩︎
Armour JA, Hopkins DA. Anatomy of the intrinsic cardiac nerves. In: Randall WC, editor. Neurocardiology. Futura Publishing; 1984:47-65. ↩︎
Ardell JL, Armour JA. Complex neuronal integration in the cardiac nervous system. Auton Neurosci. 2016;199:10-16. PMID: 27566266. ↩︎
Goldstein DS. Dysautonomia in Parkinson disease: A decade of research. Clin Auton Res. 2023;33(1):3-17. PMID: 36719525. ↩︎