BReferred pain

Table 2-5. Types of Mechanoreceptors

Type of



Sensation Encoded


Pacinian corpuscle

Onion-like structures in the subcutaneous skin (surrounding unmyelinated nerve endings)

Vibration; tapping

Rapidly adapting

Meissner's corpuscle

Present in non-hairy skin


Rapidly adapting

Ruffini's corpuscle



Slowly adapting

Merkel's disk

Transducer is on epithelial cells


Slowly adapting

- Pain of visceral origin is referred to sites on the skin and follows the dermatome rule. These sites are innervated by nerves that arise from the same segment of the spinal cord.

-For example, ischemic heart pain is referred to the chest and shoulder.

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