TRPM3 receptors are found on relatively large axons known as A-delta fibers, which have a large diameter and myelinated axons. Due to their large size, these fibers are able to report to the spinal cord very quickly. These A-delta fibers allow for the immediate burst of pain, so that one can immediately remove themselves from the source of the pain.

Johns Hopkins University

Detects higher temperatures than TRPV1, does not respond to capsaicin, and found on larger nerve fibers like A-delta fibers (meaning they convey data and adapt much faster, provide initial sharp first wave of pain). These fibers detect burning sensations that require quick action to alleviate, such as when you touch a hot stove. 
- A-delta fibers

TRPM3

Breedlove, S. & Watson, N. (2017). Behavioral neuroscience, eighth edition. Oxford University Press.

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