LARVAL ELECTRIC ORGAN OF WEAKLY ELECTRIC FISH POLLIMYRUS (MARCUSENIUS) ISIDORI (MORMYRIDAE, TELEOSTEI)
LARVAL ELECTRIC ORGAN OF WEAKLY ELECTRIC FISH POLLIMYRUS (MARCUSENIUS) ISIDORI (MORMYRIDAE, TELEOSTEI)
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DOI：
10.1007/bf01217916
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发表时间：
1978-01-01
期刊：
影响因子：
--
通讯作者：
TSUJI, S
中科院分区：
文献类型：
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作者：
DENIZOT, JP;KIRSCHBAUM, F;TSUJI, S
电器官由4个纵向管、一对背侧管和一对腹侧管组成，起于颅骨后方，止于尾足基部，呈肌切分状。显然，基本单位是被称为电细胞的转化肌纤维。它们比肌纤维短而粗，柄长，见于深外侧肌的内侧。电镜显示细胞前后面明显不同。前部，表面膜呈深线性内陷，并可见许多直径约100纳米的小泡。后部可见许多质膜内陷和空泡，胞质细胞器、多形性细胞核、高尔基体、椭圆形线粒体和多泡体。茎起源于后表面，神经末梢位于茎的远端。在电细胞中，肌原纤维，类似于在肌肉纤维中发现的，被检测到清晰可见的Z线，但只有一个暗示的H区。两束肌原纤维在电细胞内垂直排列。强乙酰胆碱酯酶活性在前面和神经支配的茎上发现。幼虫电器官的总放电幅度峰值可达100 mV左右。脉冲持续时间为1ms，主相为正极。
The larval electric organ of P. isidori consists of 4 longitudinal tubes, a dorsal and a ventral pair, which begin behind the skull, end at the beginning of the caudal peduncle and show myotomic segmentation. The elementary units are, apparently, transformed muscle fibers called electrocytes. They are shorter and thicker than muscle fibers, with long stalks and are found in the medial part of the deep lateral muscle. EM reveals a clear difference between the anterior and posterior face of the electrocyte. Anteriorly, deep linear invaginations of the surface membrane together with many small vesicles of about 100 nm diameter are seen. Posteriorly, many plasma membrane invaginations and vacuoles are found together with numerous cytoplasmic organelles.sbd.pleiomorphic nuclei, Golgi apparatus, oblong mitochondria and multivesicular bodies. The stalk originates at the posterior face and the nerve terminals are situated at the distal end of the stalk. In the electrocyte, myofibrils, similar to those found in muscle fibers, are detected with clearly visible Z lines but with only a suggestion of H zones. Two bundles of myofibrils are seen arranged orthogonally in the electrocyte. Strong acetylcholinesterase activity is found on the anterior face and on the innervated stalk. The overall discharge amplitude of the larval electric organ reaches a maximum of about 100 mV peak to peak. The pulse duration is 1 ms and the main phase is head-positive.