INTERNAL STRUCTURE OF CAT EXTRAOCULAR-MUSCLE
INTERNAL STRUCTURE OF CAT EXTRAOCULAR-MUSCLE
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DOI：
10.1007/bf00315560
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发表时间：
1975-01-01
期刊：
影响因子：
--
通讯作者：
NEUHUBER, W
中科院分区：
文献类型：
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作者：
MAYR, R;GOTTSCHALL, J;NEUHUBER, W
本文用猫眼外肌（EOM）标本，研究了肌纤维的排列和胆碱酯酶阳性部位的分布，即（1）大运动终板，（2）"抓钩"型小运动终板，（3）肌腱接头，（4）肌肌接头。这些胆碱酯酶阳性结构的分布提供了明确的证据，一个复杂的肌肉结构的猫眼外肌。在猫眼外肌的整体层，只有多神经支配的肌纤维贯穿整个肌肉的长度。局灶性神经支配的肌纤维一般较短;它们通常排列成两到三根纤维串联，通过肌纤维连接处相互连接。此外，经常存在肌纤维分裂，导致肌纤维的网状排列。大多数肌纤维的连接发生在局灶性神经支配的肌纤维之间，但也观察到局灶性神经支配的肌纤维与多神经支配的肌纤维的端侧连接;尚未发现多神经支配的肌纤维彼此连接。在这一层，大的运动终板分布在起源和插入之间的几个带。在眶层中，所有肌纤维从肌腱到肌腱，局灶性地以及多神经支配的。在这里，大的运动终板被限制在一个乐队在中间的肌肉，和myomyous交界处一般absent.Some功能的影响，这种复杂的架构猫眼外肌进行了讨论。
Teasing preparations of cat extraocular muscles (EOM) were used to study the arrangement of muscle fibers and the distribution of the different cholinesterase-positive sites, i.e. (1) large motor endplates, (2) small motor endings of the “en grappe” type, (3) myotendinous junctions and (4) myomyous junctions. The distribution of these cholinesterase-positive structures gives clear evidence of a complex muscle architecture of cat EOM. In the global layer of cat EOM, only multiply innervated muscle fibers run the whole length of the muscle. The focally innervated muscle fibers are generally shorter; they are usually arranged in series of two to three fibers being interconnected by myomyous junctions. Moreover, muscle fiber splitting is frequently present resulting in a netlike arrangement of muscle fibers. Most of the myomyous junctions occur between focally innervated muscle fibers, but also end-to-side connections of focally to multiply innervated muscle fibers are observed; multiply innervated muscle fibers have not been found connected to each other. In this layer, large motor endplates are distributed in several bands between origin and insertion. In the orbital layer all muscle fibers run from tendon to tendon, focally as well as multiply innervated ones. Here, large motor endplates are confined to a band in the middle of the muscle, and myomyous junctions are generally absent.Some functional implications of this complex architecture of cat EOM are discussed.