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How do Pacinian corpuscles detect vibration?
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Vespid wasps (Vespidae), similar to other insects, have compound eyes that consist of thousands of tiny optical units known as ommatidia, which contain light-sensitive photoreceptor cells.
Pacinian corpuscles are specialized mechanoreceptors in the skin that function as sensors for vibration. Their structure is key to how they detect these stimuli:12
- Anatomy: Each corpuscle consists of a central nerve fiber surrounded by multiple, onionlike layers of connective tissue.12
- Mechanism: These layers act as a shock absorber, which allows the receptor to respond rapidly to fast events while damping out slower changes in pressure.1
- Transduction: Because of this design, the corpuscle is highly sensitive to vibration. When rapid mechanical deformation occurs, the stimulus is transmitted through the layers to the central nerve fiber, triggering one or two action potentials.1
The capsule is essential for this specific sensitivity; if the onionlike layers are removed, the nerve terminal remains mechanically sensitive, but the specialized ability to filter and respond to rapid vibratory events is altered.2