The transverse tubular system of cat intrafusal muscle fibres.
The transverse tubular system of cat intrafusal muscle fibres.
复制标题
猫梭内肌纤维的横向管状系统。
DOI：
10.1007/bf00218399
复制
发表时间：
1986
影响因子：
3.6
通讯作者：
Adal,MN
中科院分区：
文献类型：
--
作者：
Adal,MN
采用改良的横小管和肌浆网系统染色技术，研究了猫尾梭内不同类型肌纤维中横小管和肌浆网系统的分布情况。梭内肌纤维可分为三个基本区域，即轴周间隙（A区）、囊内区（B区）和囊外区（C区）;这些系统的组成部分在结构和分布上各不相同。这些系统的出现也不同类型的梭内肌纤维，即袋1，袋2和链纤维。在bag 1纤维成分稀疏的A-区域，略有增加的B-区域，但最发达的C-区域;三重始终位于边界之间的A-和I-带。在bag 2fibres膜组件中，注意到在A区，但更丰富的B区，其中一些管状组件显示横向和纵向分支连接在一起的网络的形式;膜系统减少向C区。大多数三联体位于A带内。在链纤维中，膜系统更常见于A区，而在B区和C区，横向管状系统具有许多横向和纵向分支，形成不规则分布的管状网络。有的管状支扩张，有的管状支终止于I带肌浆网系统阵列之间的囊状结构。一些横小管分叉成两个分支，扩张的肌浆网池位于两侧或分支之间。三联体有时出现在A带和I带之间，但一般都位于A带内。
A modified staining technique for transverse tubular and sarcoplasmic reticular systems was used to investigate their occurrence in different types of intrafusal muscle fibres in cat tail spindles. Intrafusal muscle fibres can be divided into three basic regions, namely, the periaxial space (A-region), intracapsular area (B-region) and the extracapsular area (C-region); the components of these systems were seen to vary in structure and distribution. The occurrence of these systems also varied among the different types of intrafusal muscle fibres, namely, the bag1, bag2and chain fibres. In bag1fibres components were sparse in the A-region, increased slightly in the B-region, but were most developed in the C-region; triads were consistently located at the border between A- and I-bands. In bag2fibres membrane components were noted in the A-region but were more abundant in the B-region where some tubular components showed transverse and longitudinal branches linked together in the form of a network; membrane systems diminished towards the C-region. The majority of triads were located within the A-bands. In chain fibres the membrane systems occurred more commonly in the A-region, while in the B- and C-regions, the transverse tubular system possessed numerous transverse and longitudinal branches forming irregularly distributed tubular networks. Some tubular branches were dilated, while other branches terminated as sacs among arrays of the sarcoplasmic reticular system in I-bands. Some transverse tubules bifurcated into two branches with numbers of dilated sarcoplasmic reticular cisternae lying on either side, or between, the branches. Triads sometimes occurred between A- and I-bands, but, generally, were situated well within A-bands.