The core of the Vater-Pacini corpuscle contains a single, unbranched, non-myelinated nerve fiber, which has several club-like terminals. The innervating neuron becomes myelinated once it leaves the Pacinian corpuscle on its way to the cerebral cortex. The concentric lamellae are flattened neurolemmocytes (the source of the myelin sheaths) and are separated by interstitial fluid space and delicate collagen fibers. Pressure is translated as a mechanical stimulus through the connective tissue layers and fluid, exciting the core receptor axon.