We thank prof. Dr. Med. Zdeněk Halata for microphotographs of the receptors, dr. Jiří Brabec for inspiration, dr. Rastislav Hromádka for software support, Květa Patková, technical assistent for preparing of the microscopic Nissl stained sections, Mgr. Jan Kacvinský for the muscle spindle scheme.

This work was supported by grant FRVŠ No. 424/2012.