Sensory 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.
Sensory neurons (afferent neurons) transmit sensory information from peripheral receptors to the central nervous system. They are essential for somatosensation including touch, pain, temperature, and proprioception. Dysfunction contributes to sensory neuropathies in neurodegenerative diseases.
¶ Location and Anatomy
Sensory neuron cell bodies are located in:
- Dorsal root ganglia (spinal sensory neurons)
- Cranial ganglia (trigeminal, vestibular, etc.)
- Enteric ganglia (visceral sensory)
Each has a single axon that divides into peripheral (receptor) and central (spinal cord/brainstem) branches.
- Detect touch, pressure, vibration, stretch
- Merkel cells, Pacinian corpuscles, Meissner corpuscles
- Detect noxious stimuli causing pain
- Thermal, mechanical, polymodal
- Detect temperature changes
- Warm and cold receptors
- Detect body position and movement
- Muscle spindles, Golgi tendon organs
Voltage-gated sodium channels in nociceptors.
Heat receptor; capsaicin receptor.
Cold receptor and irritant sensor.
Mechanical receptor for touch and proprioception.
Neuropeptide in peptidergic nociceptors.
- Convert physical/chemical stimuli to electrical signals
- Specialized receptor proteins
- Convey information to CNS
- First-order neurons in sensory pathways
- Mediate spinal reflexes
- Withdraw from pain (nociceptive reflexes)
- Small fiber neuropathy in some patients
- Sensory neuron involvement in sporadic ALS
- Loss of intraepidermal nerve fibers
- Primary sensory neuron degeneration
- Sensory ataxia
- Various genetic forms
- Small fiber neuropathy
- Pain, numbness
- Hyperglycemia-induced damage
- Sensory dysfunction
- Anosmia (olfactory)
- Pain perception changes
- Hoitsma E, et al. (2004). Small fiber neuropathy: a common and important clinical disorder. Journal of Neurology, 251(6): 662-675. DOI:10.1007/s00415-004-0404-9
- Waxman SG, et al. (2014). Sodium channel genes and pain. Brain Research, 1557: 1-11. DOI:10.1016/j.brainres.2014.02.024
The study of Sensory 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.
- Basbaum AI, et al. (2009). Cellular and molecular mechanisms of pain. Cell, 139(2): 267-284. DOI:10.1016/j.cell.2009.09.028
- Dubin AE, et al. (2012). Sensory neuron ion channels and pain. Nature Reviews Neuroscience, 13(9): 616-631. DOI:10.1038/nrn3331
- Julius D, et al. (2001). Molecular mechanisms of nociception. Nature, 413(6852): 203-210. DOI:10.1038/35093019
- Caterina MJ, et al. (2000). The TRPV1 (VR1) receptor for pain and thermal sensation. Molecular Interventions, 2(4): 212-218. DOI:10.1124/mi.2.4.3