Internal kinematics of the tongue in relation to muscle activity and jaw movement in the pig
Internal kinematics of the tongue in relation to muscle activity and jaw movement in the pig
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DOI：
10.1111/j.1365-2842.2009.01981.x
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发表时间：
2009-09-01
影响因子：
2.9
通讯作者：
Seifi, A.
中科院分区：
文献类型：
--
作者：
Liu, Z. -J.;Shcherbatyy, V.;Seifi, A.
为探讨进食过程中舌变形、肌肉活动和颌运动的协调特征，在记录前1周将6个超声晶体植入10头12周龄尤卡坦小型猪舌体。这些晶体形成楔形配置，以允许在进食期间记录舌体的长度、前部和后部宽度以及后部厚度的尺寸变化。同时记录上级肌、下颌肌、垂直肌/横肌、颏舌肌、茎突舌肌、咬肌、二腹肌的肌电活动和下颌运动。来自这三个来源的信号被同步用于实时分析。结果表明：（i）在所有三种进食行为的每个周期中，尺寸变化都是定型的;（2）咀嚼时舌宽的扩大主要发生在下颌运动的咬合阶段，与舌肌活动的耦合性较低，而舌长和舌厚的扩张则出现在舌的张开期和闭合期，并与舌肌的活动有较好的耦合（3）摄食的特点是两阶段的下颌张开，前宽在咬合期之前的早期扩张，舌变形与肌肉活动之间有很强的相关性;（iv）在饮酒过程中，开放期和关闭期的持续时间显著延长（P <0.01），舌增宽、延长持续时间明显缩短（P <0.05），与咀嚼和摄食相比，前牙区增宽主要发生在开口期，而不是闭合期或咬合期;舌内肌与舌变形的相关性并不比舌外肌强。这些结果表明：（1）舌体的局部增宽、延长和增厚与下颌运动时相顺序发生，但舌体尺寸扩张的开始并不与舌肌的激活同时发生;（2）舌体变形与舌肌激活在矢状面上有较好的耦合关系。（延长和增厚）比横向（加宽）平面;以及（iii）舌变形的模式和范围及其与肌肉活动和颌运动的关系是任务-舌变形的扩张幅度与舌肌或颌肌的肌电活动量的内在相关性不高于外在相关性。
P>To explore the coordinative characteristics of tongue deformation, muscle activity and jaw movement during feeding, six ultrasonic crystals were implanted into the tongue body of ten 12-week-old Yucatan minipigs 1 week before the recording. These crystals formed a wedge-shaped configuration to allow recording dimensional changes in lengths, anterior and posterior widths and posterior thicknesses of the tongue body during feeding. Wire electromyographic activities (EMG) of superior and inferior longitudinalis, verticalis/transversus, genioglossus, styloglossus, masseter and digastricus and jaw movements were recorded simultaneously. Signals from these three sources were synchronized for real-time analyses. The results indicate: (i) dimensional changes were stereotypical in relation to each cycle of all three feeding behaviours; (ii) during chewing, expansion of tongue widths mainly occurred in the occlusal phase of jaw movement and was less coupled with the activity of tongue muscles, but the expansions of length and thickness were seen in the opening and closing phases and were better coupled with the activity of tongue muscles (P < 0 center dot 05); (iii) ingestion was characterized by the two-phased jaw opening, early expansion of anterior width prior to the occlusal phase and strong associations between tongue deformation and muscle activity; (iv) during drinking, the duration of the opening and closing phases was significantly prolonged (P < 0 center dot 01), the durations of tongue widening and lengthening were significantly shortened (P < 0 center dot 05) and anterior widening was predominant in the opening rather than in the closing or occlusal phases as compared with chewing and ingestion; and (v) the intrinsic tongue muscles did not show more or stronger correlations with the tongue deformation than did the extrinsic tongue muscles. These results suggest that (i) regional widening, lengthening and thickening of the tongue body occurs sequentially in relation to jaw movement phases, but the initiation of tongue dimensional expansions does not correspond with the activation of tongue muscles simultaneously; (ii) there is a better coupling between tongue deformations and tongue muscle activations in the sagittal (lengthening and thickening) than the transverse (widening) planes; and (iii) the patterns and ranges of tongue deformation and their relations to muscle activity and jaw movement are task-specific and the expansion magnitudes of tongue deformation does not have closer correlations with the amount of EMG activity in the intrinsic than the extrinsic tongue or jaw muscles.