Purkinje cells have which dendritic arborization?

Purkinje cells have which dendritic arborization?

• A. They have a single dendrite
• B. They have many dendrites forming elaborate trees with dendritic spines
• C. They have no dendrites
• D. They have only axons

Answer: (B)

Purkinje cells are known for their highly elaborate dendritic arbor in the cerebellar cortex. They extend many dendritic branches that form an extensive, fan-like tree, each dendrite studded with numerous dendritic spines. This expansive, spine-rich arbor provides a large surface area to receive a vast array of excitatory inputs—from granule cell parallel fibers and climbing fibers—allowing the cell to integrate diverse signals effectively. The abundance of dendritic spines specifically creates many postsynaptic sites for these inputs, which is essential for how Purkinje cells process and modulate cerebellar output. While Purkinje cells do have a single axon projecting to deep cerebellar nuclei, the key feature described here is the numerous, highly branched dendrites with spines.

Purkinje cells are known for their highly elaborate dendritic arbor in the cerebellar cortex. They extend many dendritic branches that form an extensive, fan-like tree, each dendrite studded with numerous dendritic spines. This expansive, spine-rich arbor provides a large surface area to receive a vast array of excitatory inputs—from granule cell parallel fibers and climbing fibers—allowing the cell to integrate diverse signals effectively. The abundance of dendritic spines specifically creates many postsynaptic sites for these inputs, which is essential for how Purkinje cells process and modulate cerebellar output. While Purkinje cells do have a single axon projecting to deep cerebellar nuclei, the key feature described here is the numerous, highly branched dendrites with spines.