Is denervation supersensitivity a change in axons or...

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Key Concepts

Denervation Supersensitivity

Denervation supersensitivity is a phenomenon in neural physiology where target cells, such as neurons or muscle cells, become more sensitive to neurotransmitters after the loss of their normal input. This hypersensitivity is often due to the upregulation of receptors that occurs in response to reduced stimulation.

Postsynaptic Receptor Regulation

This concept refers to the adjustment in the number or sensitivity of receptors located on the postsynaptic membrane, typically on dendrites. In the context of denervation supersensitivity, postsynaptic receptors are upregulated to compensate for the loss of presynaptic input, leading to an enhanced response to neurotransmitters.

Axonal and Dendritic Structures

Axons and dendrites serve different roles in neuronal communication; axons carry signals away from the cell body to other neurons or tissues, while dendrites receive synaptic signals. In denervation supersensitivity, the critical changes occur on dendritic receptors rather than on the axons, reflecting a postsynaptic adaptation to reduced neural input.

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