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METHODS calcium dependence; contraction coupling; mammalian fibers skeletal muscle; excitation- MUSCLES (EOMs) of mammals contain several types of muscle fibers that, according to their innervation, can be divided into two main types: singly multiply innervated fibers. These two types of fibers occur intermingled within the muscleâs two layers: orbital or outer global or inner (11). The multiply innervated fibers (MIFs) of the global layer have morphological physiological properties comparable to those of the slow or fibers of amphibians. For instance, at an ultrastructural level, cross sections of global MIFs display large or indistinct myofibrils have a low to moderate content of sarcoplasmic reticulum (SR) mitochondria (11,29). They receive polyneuronal innervation, lack action potentials, have a large input resistance long membrane time constant (8, 21). Finally, global MIFs generate a when depolarized with cholinergic drugs or K+ (10). To define a possible role of external Ca2â EXTRAOCULAR Inferior rectus muscles were dissected from 125- to 175-g Wistar rats under sodium thiamylal anesthesia, 4 mg/lOO g weight of rat, ip. To reduce diffusional delays, most of the belly of the muscle, made up by the orbital layer (29), was removed leaving the global layer. The preparation was mounted horizontally in
AJP - Cell Physiology – The American Physiological Society
Published: Sep 1, 1987
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