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Dependence of tonic tension on extracellular calcium in rat extraocular muscle

Dependence of tonic tension on extracellular calcium in rat extraocular muscle 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 muscle’s 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 Ca2’ 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 http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png AJP - Cell Physiology The American Physiological Society

Dependence of tonic tension on extracellular calcium in rat extraocular muscle

D. J. Chiarandini and J. Jacoby
AJP - Cell Physiology , Volume 253: C375 – Sep 1, 1987
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Publisher
The American Physiological Society
Copyright
Copyright © 1987 the American Physiological Society
ISSN
0363-6143
eISSN
1522-1563
Publisher site
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Abstract

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 muscle’s 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 Ca2’ 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

Journal

AJP - Cell Physiology – The American Physiological Society

Published: Sep 1, 1987

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