Abstract
Peripheral nerve fasciculi, supplying filiform papillae, are composed of unmyelinated and a few myelinated axons. The nerve fibers are surrounded by an one-layered perineural sheath and run, in parallel to the capillary loops, towards the tip of the papilla. Myelinated axons devide and lose their myelin sheath, and somewhat later their perineurium ends. Unmyelinated axons show striking swellings caused by an accumulation of mitochondria. These structures are believed to represent the receptive sites (presumably thermo- or mechano-receptors) of nerves. Fine unmyelinated fibers enter the epithelium. Schwann cell nuclei, surrounded by large cytoplasmic areas occur near the epithelium.
