Interoceptors is an important component in the neurobiology of neurodegenerative diseases. This page provides detailed information about its structure, function, and role in disease processes.
Interoceptors are sensory receptors that detect internal body states including blood pressure, pH, oxygen levels, and nutrient concentrations. They are fundamental to homeostasis.
Interoceptors are sensory receptors that detect stimuli from within the body, monitoring the internal state of organs and tissues. They provide essential feedback for homeostatic regulation and contribute to visceral sensation.
The term "interoception" refers to the sense of the physiological condition of the body. Interoceptors detect:
- Visceral sensations
- Internal organ status
- Homeostatic signals
- Baroreceptors: Blood pressure monitoring
- Stretch receptors: Organ distension
- Tensoreceptors: Tension in hollow organs
- Chemoreceptors: O2, CO2, pH levels
- Glucose sensors: Blood sugar monitoring
- Osmoreceptors: Fluid balance
- Core temperature detection
- Hypothalamic thermoreceptors
- Arterial baroreceptors: Carotid sinus, aortic arch
- Cardiac mechanoreceptors: Atrial and ventricular stretch
- Cardiac chemoreceptors: Ischemia detection
- Pulmonary stretch receptors: Hering-Breuer reflex
- Irritant receptors: Cough trigger
- J receptors: Pulmonary edema detection
- Mucosal chemoreceptors: Nutrient detection
- Stretch receptors: Distension sensing
- Luminal sensors: pH, nutrient content
- Juxtaglomerular apparatus: Renin release
- Macula densa: Sodium detection
- Renal mechanoreceptors: Volume sensing
- Primary pathway for thoracic and upper abdominal viscera
- Afferents to nucleus tractus solitarius (NTS)
- Integrates with autonomic reflex circuits
- Pelvic and splanchnic nerves
- Convey pain and intense visceral sensation
- Enter spinal cord at T1-L2, S2-S4
- Brainstem: Reflex integration
- Hypothalamus: Homeostatic regulation
- Thalamus: Relay to cortex
- Insula: Conscious visceral perception
- Anterior cingulate: Visceral affect
- Autonomic dysfunction prominent
- Baroreflex impairment
- Visceral hypersensitivity or hyposensitivity
- Severe cardiovascular dysregulation
- Baroreceptor failure
- Orthostatic hypotension
- Cardiovascular: resting tachycardia, orthostatic hypotension
- Gastrointestinal: gastroparesis, constipation
- Bladder dysfunction
- Autonomic changes reported
- Altered visceral perception
- Weight and appetite changes
- Anterior insular cortex: Interoceptive awareness
- Anterior cingulate cortex: Visceral pain, emotion
- Somatosensory cortex: Body representation
- Hypothalamus: Homeostatic control
- Heart beat detection
- Gut sensation awareness
- Thirst and hunger signaling
- Heightened interoceptive awareness
- Hypervigilance to bodily sensations
- Visceral hypersensitivity
- Irritable bowel syndrome
- Baroreflex dysfunction
- Orthostatic intolerance
- Visceral pain processing
- Central sensitization
The study of Interoceptors 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.
- Craig AD. (2002). How do you feel? Interoception: the sense of the physiological condition of the body. Nat Rev Neurosci. DOI:10.1038/nrn895
- Critchley HD, Harrison NA. (2013). Visceral influences on brain and behavior. Neuron. DOI:10.1016/j.neuron.2013.02.008
- Barrett LF, Quigley KS, Hamilton P. (2016). An active inference theory of allostasis and interoception in depression. Philos Trans R Soc B. DOI:10.1098/rstb.2015.0237