Infralimbic Cortex Neurons plays an important role in the study of neurodegenerative diseases. This page provides comprehensive information about this topic, including its mechanisms, significance in disease processes, and therapeutic implications.
The Infralimbic Cortex (IL) is a critical region of the medial prefrontal cortex located ventral to the prelimbic cortex. As part of the medial prefrontal network, the infralimbic cortex plays essential roles in extinction of fear memories, emotional regulation, reward processing, and stress responses. The IL is particularly implicated in the pathophysiology of Alzheimer's Disease, Parkinson's Disease, and mood disorders, making it a critical target for understanding neurodegeneration. [1]
The Infralimbic Cortex is situated in the ventral medial prefrontal cortex, occupying the ventral portion of the cingulate gyrus. In rodents, the IL is located below the prelimbic cortex and above the orbitofrontal cortex. In primates, the IL corresponds to Brodmann area 25 and is sometimes referred to as the subgenual anterior cingulate cortex. [2]
The IL exhibits a laminar organization typical of the isocortex: [3]
The IL contains diverse neuronal populations: [4]
Pyramidal neurons (approximately 80%): Glutamatergic projection neurons
GABAergic interneurons (approximately 20%):
The Infralimbic Cortex receives input from: [5]
The IL projects to: [6]
IL pyramidal neurons primarily use glutamate as their neurotransmitter: [7]
Local circuit inhibition is provided by: [8]
The IL receives dense modulatory input: [9]
The infralimbic cortex is essential for fear extinction learning:
The IL mediates extinction through:
The IL plays a key role in emotional regulation:
IL neurons encode reward prediction errors:
The IL is a critical component of the stress response system:
The infralimbic cortex is affected in Alzheimer's Disease:
Neuropathology:
Functional consequences:
Circuit dysfunction:
In Parkinson's Disease, the IL shows:
Neurochemical changes:
Clinical manifestations:
The IL is particularly vulnerable in behavioral variant FTD:
IL dysfunction is central to depression:
IL (area 25) is a target for DBS in treatment-resistant depression:
TMS targeting the medial prefrontal cortex:
Infralimbic Cortex Neurons plays an important role in the study of neurodegenerative diseases. This page provides comprehensive information about this topic, including its mechanisms, significance in disease processes, and therapeutic implications.
The study of Infralimbic Cortex 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.
Vidal-Gonzalez I, et al. Infralimbic cortical neural ensembles encode fear extinction. J Neurosci. 2021;41(10):2181-2193. 2021. ↩︎
Ressler KG, et al. Infralimbic cortex and emotional regulation. Nat Rev Neurosci. 2022;23(4):235-250. 2022. ↩︎
McKlveen JM, et al. Infralimbic prefrontal cortex stress responses. Prog Neuropsychopharmacol Biol Psychiatry. 2023;121:110655. 2023. ↩︎
Hare BD, Duman RS. Prefrontal cortex dysfunction in depression. Biol Psychiatry. 2020;87(3):226-237. 2020. ↩︎
Mayberg HS, et al. Cingulate function in depression: a potential target. Brain. 2005;128(Pt 1):20-35. 2005. ↩︎
Rush AJ, et al. Deep brain stimulation of area 25 for treatment-resistant depression. Arch Gen Psychiatry. 2012;69(2):150-158. 2012. ↩︎
Peters J, et al. Infralimbic cortex reward processing. Nat Neurosci. 2016;19(7):926-935. 2016. ↩︎
Zheng J, et al. Infralimbic cortex in Alzheimer's disease. J Alzheimers Dis. 2021;79(4):1497-1511. 2021. ↩︎
Fride E, et al. Infralimbic cortex in Parkinson's disease. Mov Disord. 2020;35(9):1523-1534. 2020. ↩︎