A contribution to the problem of thermosensors in skeletal muscles.

The authors is approaching two different issues as following: thè action of thè cold on acupuncture points and thè thermoperception and thermosensors in skeletal muscles. Around thè perimysium (muscular connectif tissue) a located thè so-called "free nerve ending" are formed mainly by nerve flbers of groups II, III and IV. Some of them are polymodal, others form a group of specific thermosensors. Also thè actual morphological findings divide "free" nerve endings into several structurally different groups, supporting thus thè view of relative specificity of peripheral sensors. According to these findings thè group II of afferent nerve fibers is missing in some muscle's spindles. The authors express thè view that thè presence of thè group II of nerve's fibers might be responsible also for cold perception. The sensitivity of some mechanosensors to temperature may be a result of their differentiation as temperature's informers. Those informations are of great importance for thè thermoregulatory center and are not necessary connected with subjective feeling.