“…The same was earlier described in the cat [Manolov et al, 1965], dog [Ibrahim et al, 1980], human [Rudolph, 1960;Kupfer, 1960], and some domestic animals [Veg getti and Mascarello, 1979]. Such a multiple or poly synaptic innervation of muscle fibers serves, in our opin ion, specific functional needs, at least in nature: (a) to determine a faster and stronger answer by a larger neurotransmitter contribution in several areas of the same muscle fiber as sustained by Hunt and Kuffler [1954], Rudolph [1960], andAbo El-Enene [1975] and (b) to obtain a fast contraction even by slow-tonic mus cle fibers, as postulated by Yellin [1969], Very long, complex or 'en grappe' neuroterminals have been described in M. quadratus of the upper lip of the rabbit [Bowden and Mahran, 1956], within the mimic musculature of cat.…”