ARTICLE

STUDIES OF THE TRIAD : IV. Structure of the Junction in Frog Slow Fibers

Clara Franzini-Armstrong ¹

¹ From the Department of Physiology, University of Rochester School of Medicine and Dentistry, Rochester, New York 14620

The structure of the triadic junction in frog slow fibers has been studied and compared with that of twitch fibers. The junctional gap is wider (by approximately 13%) in slow fibers. The junctional feet have the same size and disposition as in twitch fibers, although the size and shape of the junctional areas are different. It is concluded that the role of triads in slow fibers is the same as in twitch fibers

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