Fine Structure of the Leaf-like Receptor in the Frog Sartorius Muscle

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  • Ito Fumio
    Department of Physiology, School of Dentistry, Aichi-Gakuin University
  • Miwa Shigeko
    Department of Physiology, School of Dentistry, Aichi-Gakuin University

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Abstract

1. The ultrastructure of leaf-like receptors in the frog sartorius muscle was studied. The receptor and its innervating axon were isolated with some muscle fibers after the characteristic patterns of afferent discharges were recorded from the axon.2. The stem myelinated axon divided into two or four branches and often further subdivided two or three times, before the d emyelination. The axon and branches were loosely wrapped by a perineurial sheath of one or two layers.3. There were a few preparations in which a very thin thread-like nonmyelinated fiber appeared in the vicinity of the Schwann cell nucleus located arround the ramification points of the myelinated axon but could not be detected at the last myelinated segments or more distally, except in two preparations where the stein axon was accompanied by a nonmyelinated fiber.4. Nonmyelinated sprouts of 0.1- to 1 a in diameter were emitted from the last nodes of the axon. They were encircled by a Sc hwann cell process with an interspace of approximately 200 A. These nonmyelinated sprouts appeared at first in the same perineurial covering as the last myelinated branch and then they appeared in a separate compartment.5. No structural difference between the low and high threshold receptor could be detected.354 Fumio Ito and Shigeko Miwa

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