BReferred pain

Table 2-5. Types of Mechanoreceptors

Type of

Mechanoreceptor

Description

Sensation Encoded

Adaptation

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

Velocity

Rapidly adapting

Ruffini's corpuscle

Encapsulated

Pressure

Slowly adapting

Merkel's disk

Transducer is on epithelial cells

Location

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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