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The amygdaloid complex: anatomy and physiology
P Sah1, E S L Faber, M Lopez De Armentia
1School of Biomedical Sciences, The University of Queensland, Brisbane, Queensland 4072, Australia. pankaj.sah@anu.edu.au
Physiological Reviews
|July 5, 2003
Summary
The amygdala is crucial for processing fear and emotional significance. Research shows its synaptic plasticity is key to fear memory, potentially explaining anxiety disorders.
Area of Science:
- Neuroscience
- Neurobiology
- Psychology
Background:
- The amygdala is implicated in assigning emotional significance to sensory input.
- It plays a key role in fear responses and is linked to anxiety disorders.
- The amygdaloid complex comprises over 10 nuclei in the midtemporal lobe.
Purpose of the Study:
- To review the anatomical and physiological substrates of amygdala function.
- To explore the amygdala's role in fear processing and memory.
- To connect amygdala dysfunction to human anxiety disorders.
Main Methods:
- Review of anatomical tract tracing studies.
- Analysis of fear conditioning in rats.
- Examination of in vitro and in vivo synaptic plasticity studies.
Main Results:
- The amygdala has extensive intra- and internuclear connections.
- It connects widely with cortical and subcortical regions.
- Long-term synaptic plasticity in the amygdala underlies fear memory acquisition and storage.
Conclusions:
- The amygdala's intricate circuitry and synaptic plasticity are fundamental to its role in fear.
- Understanding these mechanisms is vital for addressing anxiety disorders.
- Further research into amygdala function can inform therapeutic strategies.
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