Pyramidal 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. [1]
Pyramidal neurons are the principal excitatory neurons in the cerebral cortex and hippocampus. They are characterized by their triangular-shaped cell bodies (soma) and long apical dendrites. These neurons are the primary projection neurons, sending axons to distant brain regions and forming the major output of the cortical column. Pyramidal neurons constitute approximately 70-80% of cortical neurons in the mouse brain and represent the dominant excitatory cell type in the mammalian neocortex. [2]
| Taxonomy | ID | Name / Label |
|---|---|---|
| Cell Ontology (CL) | CL:0000598 | pyramidal neuron |
| Database | ID | Name | Confidence |
|---|---|---|---|
| Cell Ontology | CL:0000598 | pyramidal neuron | Exact |
| Cell Ontology | CL:1001571 | hippocampal pyramidal neuron | Exact |
| Cell Ontology | CL:4023041 | L5 extratelencephalic projecting glutamatergic cortical neuron | Exact |
| Layer | Type | Projection Target | Markers |
|---|---|---|---|
| L2/3 | Intratelencephalic | Contralateral cortex, striatum | Cux1, Cux2 |
| L5 PT | Extratelencephalic | Subcortical, brainstem | CTIP2, SATB2 |
| L6 CT | Corticothalamic | Thalamus | TBR1, CTIP2 |
Pyramidal neurons integrate thousands of synaptic inputs across their elaborate dendritic trees. The apical dendrite extends radially through multiple cortical layers, receiving inputs from various neuronal types:
Dendritic spines (approximately 10,000-30,000 per neuron) serve as primary sites of excitatory synaptic contact. Each spine contains the postsynaptic density (PSD) with glutamate receptors (AMPARs, NMDARs, mGluRs). [3]
Pyramidal neurons exhibit several key electrophysiological properties:
The axon initial segment (AIS), rich in voltage-gated Na+ channels (Nav1.2, Nav1.6), is the primary site of action potential initiation. [4]
Pyramidal neurons form the core of cortical information processing:
Pyramidal neurons show multiple pathological changes in AD:
Cortical pyramidal involvement in PD:
The study of Pyramidal 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.
Spruston N. Pyramidal neurons: dendritic structure and synaptic integration. Nat Neurosci. 2008. 2008. ↩︎
DeFelipe J. The pyramidal neuron. Cereb Cortex. 2023. 2023. ↩︎
Srivastava I, et al. Dendritic spine geometry and organization. Neural Plast. 2023. 2023. ↩︎
Kole MH, et al. Action potential generation in neocortical pyramidal neurons. J Neurosci. 2024. 2024. ↩︎
Gomez-Isla T, et al. Neuronal loss in Alzheimer's disease. Ann Neurol. 2024. 2024. ↩︎