Basket cell

Anatomy and physiology

Basket cells are multipolar GABAergic interneurons that function to make inhibitory synapses and control the overall potentials of target cells. In general, dendrites of basket cells are free branching, contain smooth spines, and extend from 3 to 9 mm. Axons are highly branched, ranging in total from 20 to 50mm in total length. The branched axonal arborizations give rise to the name as they appear as baskets surrounding the soma of the target cell. Basket cells form axo-somatic synapses, meaning their synapses target somas of other cells. By controlling the somas of other neurons, basket cells can directly control the action potential discharge rate of target cells.

Basket cells can be found throughout the brain, in among other the cortex, hippocampus, amygdala, basal ganglia, and the cerebellum.

Cortex

In the cortex, basket cells have sparsely branched axons giving off small pericellular, basket-shaped elaborations at several intervals along their length. Basket cells make up 5-10% of total neurons in the cortex. There are three types of basket cells in the cortex, the small, large and nest type: The axon of a small basket cell arborizes in the vicinity of that same cell's dendritic range, this axon is short. In contrast, large basket cells innervate somata in different cortical columns due to a long axon. The nest basket cells are an intermediate form of the small and large cells, their axons are confined mainly to the same cortical layer as their somata. Nest basket cells have "radiating axonal collaterals" between that of large and small basket cells. They are included as basket cells because they are interneurons that perform axo-somatic synapses.

Hippocampus

Hippocampal basket cells target somata and proximal dendrites of pyramidal neurons. Similar to their counterparts in the cortex, hippocampal basket cells are also parvalbumin-expressing and fast-spiking. In the CA3 region of the hippocampus, basket cells can often form recurrent inhibition loops with pyramidal cells. Projections from a pyramidal cell will innervate the basket cell, which in turn has a projection back onto the original pyramidal cells. Since basket cells are inhibitory, this generates a closed loop that can help dampen excitatory responses.

Cerebellum

In the cerebellum, the multipolar basket cells have branching dendrites, which are dilated and knotty. Basket cells synapse on the cell bodies of Purkinje cells and make inhibitory synapses with Purkinje cells. Cerebellar basket cell axons fire inhibitory neurotransmitters such as GABA to Purkinje cell axons, and inhibits the Purkinje cell. Purkinje cells send inhibitory messages to the deep cerebellar nuclei and are responsible for the sole output of motor coordination from the cerebellar cortex. With the work of the basket cell, Purkinje cells do not send the inhibitory response for motor coordination and motor movement occurs.

Additional images

Image:Diagram of the Microanatomy of Human Cerebellar Cortex.svg|Microcircuitry of the cerebellum. Excitatory synapses are denoted by (+) and inhibitory synapses by (-). Basket cell labeled BC. Image:Cerebellum - biel - high mag.jpg|Cerebellum

References

References

1. Jones, Edward. (1984). "Cerebral Cortex: Volume 1: Cellular Components of the Cerebral Cortex". Springer.
2. (May 2015). "Stahl's Essential Pharmacology".
3. (1984). "Cerebral cortex: cellular components of the cerebral cortex". Plenum Press.
4. (1995). "Synchronization of neuronal activity in hippocampus by individual GABAergic interneurons". Nature.
5. (2002). "Anatomical, Physiological, Molecular and Circuit Properties of Nest Basket Cells in the Developing Somatosensory Cortex". Cerebral Cortex.
6. "Barrel Cortex". Cambridge University Press.
7. (2004). "Electrophysiological classes of neocortical neurons". Neural Networks.
8. Bryne, John. "Feedback/recurrent inhibition: Feedback inhibition in microcircuits". University of Texas Health Center.
9. (1998). "Patch-clamp recordings from cerebellar basket cell bodies and their presynaptic terminals reveal an asymmetric distribution of voltage-gated potassium channels". The Journal of Neuroscience.
10. (1999). "Modulation by K+channels of action potential-evoked intracellular Ca2+concentration rises in rat cerebellar basket cell axons". The Journal of Physiology.