What types of receptors are phasic receptors and why?

Anatomy Questions: Please answer all of the following

a. Following an automobile accident, Frank had to have his arm amputated as a result of crushing injuries. Even though his hand is gone, he often states he can still feel pain in his fingers, especially when he bumps the stub. What is Frank experiencing? How can this occur?​

b. What types of receptors are phasic receptors and why? Tonic? Why?

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