The pteropod mollusc Clione limacina is a feeding specialist, preying on shelled pteropods of the genus Limacina. Specialized prey-capture structures, called buccal cones, are hydraulically everted from within the mouth to capture the prey. Once captured, the prey is manipulated so the shell opening is over the mouth of Clione. Analyses of high-speed cine sequences of prey capture suggest that the mouth is actively opened rather than passively forced open by buccal cone eversion. The inflated buccal cones are initially straight and form a wide angle (maximum, 113°) prior to prey contact. Individual buccal cones bend orally following prey contact, suggesting a sensory trigger. To determine the muscular basis of buccal cone movements, the musculature of the buccal cones is described. Three distinct muscle fiber types include circular smooth muscle, longitudinal smooth muscle, and longitudinal striated muscle. The organization, distribution, and innervation of the muscle types suggest that circular muscle is used during buccal cone eversion, longitudinal smooth muscle is used for buccal cone withdrawal, and longitudinal striated muscle is used for oral bending of the buccal cones after prey contact and for manipulation of the prey.

中文翻译：

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翼足类软体动物 Clione limacina 颊锥肌肉组织的组织

翼足类软体动物 Clione limacina 是饲养专家，捕食 Limacina 属的带壳翼足类动物。特殊的猎物捕获结构，称为颊锥，从嘴内液压外翻以捕获猎物。一旦被捕获，猎物就会被操纵，使贝壳开口在 Clione 的嘴上。对猎物捕获的高速电影序列的分析表明，嘴巴是主动张开的，而不是被颊锥外翻被动地强迫张开。膨胀的颊锥最初是直的，并在接触猎物之前形成一个广角（最大，113°）。个体的颊锥在猎物接触后口腔弯曲，表明是感觉触发。为了确定颊锥运动的肌肉基础，描述了颊锥的肌肉组织。三种不同的肌纤维类型包括圆形平滑肌、纵向平滑肌和纵向横纹肌。肌肉类型的组织、分布和神经支配表明，在颊锥外翻时使用环形肌，在颊锥后缩时使用纵向平滑肌，在猎物接触后使用纵向横纹肌进行颊锥的口腔弯曲。操纵猎物。