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The Journal of Comparative Neurology and Psychology
(Continuing the Journal of Comparative Neurology.)
C. L. HERRICK, Socorro, New Mexico.
HERBERT S. JENNINGS,
University of Pennsylvania.
J. MARK BALDWIN, Johns Hopkins University
B. F, KINGSBURY, Cornell University,
Comparative Neurology and Psychology
THE RELATION OF THE MOTOR ENDINGS ON THE MUSCLE OF THE FROG TO NEIGH
By JOHN GORDON Wilson, M.A., M.B., (Edin.) (From the Hull Anatomical Laboratory of the University of Chicago.)
With Plates I and II,
It is obviously a matter of some importance in the study of the relation of nerve excitability to muscle contraction, to determine the manner in which the peripheral part of the neurone is related to the muscle fiber. Nor has it been neglected; it has long been a favorite subject for investigation and a prolific field for speculation and debate. At the present time renewed attention is being called to it by the recent works of of Apáthy, RUFFINI, GRABOWER and others.
In these writings special emphasis is being laid on the presence of fine fibrillae, called by RUFFINI ultra-terminal fibrillae, which are projected from nerve endings to various neighboring parts.
From an historical standpoint it is extremely interesting to compare the results of KÜHNE with those of Ruffini, DOGIEL, HUBER, SIHLER and others, and to observe that as methods and technique improve, a corresponding complexity can be shown in the relation of nerve to muscle. This is well exemplified in the ending of the motor neurone on the frog's muscle. As regards this animal one must acknowledge that the remarks of Apáthy on nerve endings in invertebrate muscles are not inappropriate :
"Wenn ich auch hier und da schlechthin von Nervenendigungen spreche, so will ich doch gleich hier von vorn herein betonon, dass ich eine Endigung der leitenden Primitivfibrillen nirgends mit Sicherheit constatiren konnte; ich kann nur sagen, bis wie weit ich eine leitende