Laser Technician (International Board of Electrologist Certification) IBEC Board Exam

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Which receptors respond to sensations of pain?

Meissner's corpuscles
Free nerve endings
Pacinian corpuscles
Ruffini corpuscles

The correct answer is: Free nerve endings

Free nerve endings are the receptors that specifically respond to sensations of pain. These endings are distributed widely throughout the body, particularly in the skin and internal tissues. They play a crucial role in detecting painful stimuli caused by injury, inflammation, or harmful environmental factors. Meissner's corpuscles are primarily sensitive to light touch and are more concentrated in areas such as the fingertips and lips. Pacinian corpuscles are responsible for detecting deep pressure and vibration, while Ruffini corpuscles respond to skin stretch and continuous pressure. Each of these receptors has distinct functions in sensory perception, but only free nerve endings are directly involved in transmitting pain signals to the central nervous system.