Kier William M
Department of Biology, Coker Hall, University of North Carolina, Chapel Hill, North Carolina 27599-3280.
J Morphol. 1996 Sep;229(3):271-288. doi: 10.1002/(SICI)1097-4687(199609)229:3<271::AID-JMOR3>3.0.CO;2-1.
The ultrastructural differentiation of two muscle fiber types of the squid Sepioteuthis lessoniana was correlated with development of prey-capture behavior. Transmission electron microscopy was used to document the differentiation of the fast-contracting cross-striated muscle cells of the tentacles and the obliquely striated muscle cells of the arms of specimens sampled at one week intervals from hatching to 5 weeks. By using high-speed video recordings, the ultrastructural differentiation was correlated with changes in prey-capture behavior that occur during development and growth. The ultrastructural analysis focused on the muscle cells of the transverse muscle of the tentacles and the transverse muscle of the arms. For the first 2 weeks after hatching, the tentacle transverse muscle fibers do not show the adult ultrastructure and are indistinguishable from the obliquely striated fibers of the transverse muscle of the arms. Transverse striation of the tentacle muscle cells appears at approximately three weeks and adult ultrastructure is present by 4-5 weeks after hatching. The high-speed video recordings show correlated behavioral changes. During the first 2-3 weeks after hatching, the animals use a different prey-capture mode from the adults; they jet forward and capture the prey with splayed arms and tentacles rather than employing the rapid tentacular strike. © 1996 Wiley-Liss, Inc.
莱氏拟乌贼两种肌纤维类型的超微结构分化与捕食行为的发育相关。利用透射电子显微镜记录了从孵化到5周龄、每隔一周取样的标本触须快速收缩横纹肌细胞和腕部斜纹肌细胞的分化情况。通过高速视频记录，将超微结构分化与发育和生长过程中捕食行为的变化相关联。超微结构分析聚焦于触须横纹肌和腕部横纹肌的肌细胞。孵化后的前两周，触须横纹肌纤维未显示出成体超微结构，与腕部横纹肌的斜纹纤维无法区分。触须肌细胞的横纹大约在三周时出现，孵化后4 - 5周时呈现成体超微结构。高速视频记录显示出相关的行为变化。孵化后的前2 - 3周，幼体采用与成体不同的捕食模式；它们向前喷射，用张开的腕部和触须捕获猎物，而不是采用快速的触须攻击。© 1996威利 - 利斯公司。
