MUSCLE SYSTEM ORGANIZATION IN THE ECHINODERMS .3. FINE-STRUCTURE OF THE CONTRACTILE APPARATUS OF THE ARM FLEXOR MUSCLES OF THE COMATULIDS (ANTEDON-MEDITERRANEA)
MUSCLE SYSTEM ORGANIZATION IN THE ECHINODERMS .3. FINE-STRUCTURE OF THE CONTRACTILE APPARATUS OF THE ARM FLEXOR MUSCLES OF THE COMATULIDS (ANTEDON-MEDITERRANEA)
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DOI：
10.1002/jmor.1051850106
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发表时间：
1985-01-01
影响因子：
1.5
通讯作者：
SAITA, A
中科院分区：
文献类型：
--
作者：
CARNEVALI, MDC;SAITA, A
海百合臂肌由斜条纹纤维组成，在功能和超微结构上有显著差异。这些纤维主要根据肌丝排列的不同（A-型和B-型）来区分，并在臂的不同水平（近端、中间和远端）有不同的组合。一些罕见的光滑纤维（C-型）不规则地分布在束的周边和核心。A型和B型斜条纹纤维的特征是：（1）Z线的连续和均匀结构;（2）肌球蛋白丝的排列非常不均匀，其大小、数量和分布在不同切片之间变化很大。这种不典型的斜横纹肌的意义可能与海百合臂的双骨骼系统组合（内骨骼和水骨骼）有关。
The crinoid arm muscles consist of obliquely striated fibers with striking differences in function and in ultrastructural features. These fibers can be distinguished mainly on the basis of different myofilament arrangements (A‐ and B‐type patterns) and are variously combined at different levels (proximal, intermediate, and distal portions) of the arm. Some rare smooth fibers (C‐type) are irregularly distributed in the periphery and in the core of the bundle. The characteristic features of the A‐ and B‐type obliquely striated fibers are (1) a continuous and homogeneous structure of the Z line and (2) a very heterogeneous arrangement of myosin filaments which vary widely in size, number, and distribution from section to section. The significance of such an atypical, obliquely striated muscle may be related to the double skeletal system combination (endoskeleton and hydroskeleton) of the crinoid arms.