Swatland H J
Res Vet Sci. 1975 May;18(3):258-62.
Between birth and 10 days the mean growth rate of peroneus longus motor end plates was 0-298 mum/day. A similar rate was found in seven other muscles from different anatomical regions. At birth, sartorius spindles contained three types of intrafusal myofibres; (i) large diameter with conspicuously strong acid-stable, and moderate or strong alkali-stable adenosine triphosphatase (ATPase) reactions; (ii) large diameter with weak or negligible acid-stable and alkali-stable ATPase; (iii) small diameter with weak or negligible acid-stable, and strong alkali-stable ATPase. All had a high mitochondrial enzyme content and positive PAS reaction. With the exception of some large diameter fibres, all reacted positively for phosphorylase. The frequency distribution of diameters was unimodal at birth but by 9 or 10 days was bimodal.
在出生至10日龄期间，腓骨长肌运动终板的平均生长速率为0-298μm/天。在来自不同解剖区域的其他七块肌肉中也发现了类似的速率。出生时，缝匠肌肌梭包含三种类型的梭内肌纤维：(i) 直径大，酸性稳定且碱性稳定的腺苷三磷酸酶（ATP酶）反应明显强、中度或强；(ii) 直径大，酸性稳定和碱性稳定的ATP酶弱或可忽略不计；(iii) 直径小，酸性稳定弱或可忽略不计，碱性稳定的ATP酶强。所有这些都具有高线粒体酶含量和阳性PAS反应。除了一些大直径纤维外，所有纤维的磷酸化酶反应均为阳性。出生时直径的频率分布是单峰的，但到9或10日龄时变为双峰。
