Reilly Stephen M, Lauder George V
School of Biological Sciences, University of California, Irvine California 92717.
J Morphol. 1991 Oct;210(1):33-44. doi: 10.1002/jmor.1052100104.
The subarcualis rectus I muscle (SAR) in the feeding mechanism of four tiger salamanders (Ambystoma tigrinum) was removed early in ontogeny and these individuals were allowed to complete metamorphosis. This procedure resulted in postmetamorphic tiger salamanders which differed from control individuals in the size (and thus force generating capacity) of the SAR muscle. The experimental manipulation of muscle ontogeny allowed a test of previous hypotheses of SAR function in postmetamorphic individuals. Multivariate analysis of variance for kinematic variables measured from high-speed video records of feeding revealed that experimentally modified tiger salamanders did not protract the hyobranchial apparatus or project the tongue from the mouth during feeding. Removal of the SAR muscle resulted in significantly reduced hyobranchial elevation in the buccal cavity and reduced maximum tongue projection distance.
在四种虎螈（钝口螈属）的进食机制中，弓下直肌I（SAR）在个体发育早期被切除，这些个体随后完成变态发育。这一操作导致变态后的虎螈在SAR肌肉的大小（以及由此产生力量的能力）方面与对照个体有所不同。对肌肉个体发育的实验性操作使得对先前关于变态后个体中SAR功能的假设进行检验成为可能。对从进食的高速视频记录中测量的运动学变量进行多变量方差分析表明，经过实验改造的虎螈在进食过程中不会伸展舌骨器或从口中伸出舌头。切除SAR肌肉导致口腔内舌骨抬高显著降低，以及最大舌头伸出距离减小。
