FEEDING IN GOLDEN-HAMSTERS, MESOCRICETUS-AURATUS
FEEDING IN GOLDEN-HAMSTERS, MESOCRICETUS-AURATUS
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DOI：
10.1002/jmor.1051540305
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发表时间：
1977-01-01
影响因子：
1.5
通讯作者：
GORNIAK, GC
中科院分区：
文献类型：
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作者：
GORNIAK, GC
同时电影和肌电图记录自由喂养，未麻醉的金黄地鼠表明，他们的运动和肌肉活动在咀嚼过程中不同于那些白化病大鼠。大鼠只显示propalinal运动，而仓鼠显示横向平移以及。仓鼠和大鼠的咀嚼肌大体相似，但它们的臼齿齿系不同。当磨牙处于咬合状态时，仓鼠的互锁磨牙尖限制了前牙的突出和恢复;然而，仓鼠通过在水平面上的扭转运动很容易解锁咬合。大鼠甚至在牙齿咬合的情况下也可以进行前牙运动。在咀嚼过程中，仓鼠的下颌可以向侧面、垂直方向和前后方向运动。咀嚼轨道通常在1-3个轨道之后反转。呼吸开始于上划的开始，包括嘴闭合时向相反方向的横向移动。肌电图显示，闭合前屈肌和闭合后缩肌的对称和非对称活动在两侧产生单侧力偶。(This夫妇伴随中线关闭中风）。当口闭合时，关闭逼尿肌和关闭前肌的单侧活动也引起侧向平移。双侧力偶使一侧的逼尿肌与另一侧的前肌相对抗。在向中线对侧的外侧偏移和这些闭合肌肉的动作的同时，一侧的二腹肌前肌和翼外肌不对称地放电。下颌骨向下移动与二腹肌和翼外肌的双侧活动一致。随着下颌进一步张开，外侧翼肌的活动差异伴随着下颌骨向中线的移位。在下划结束时，所有研究的咀嚼肌都是沉默的。当内收肌在闭合开始时不对称地发射时，下颌回到中线。磨粒化似乎与最初的简单突起一致，随后伴随着侧向平移。不同的食物类型通过不同的咀嚼模式减少，当牙齿接近咬合时，差异最明显。在咀嚼过程中，翼外肌和二腹肌的放电时间更长，闭合肌肉的放电强度较低。金黄仓鼠的咀嚼模式似乎比大鼠更普遍;这种差异可能与仓鼠在颊囊中储存食物的能力直接相关。
Simultaneous cine and electromyographic records of freely feeding, unanesthetized golden hamsters show that their motion and muscular activity during mastication differ from those of albino rats. Rats show only propalinal motion while hamsters show lateral translation as well. The masticatory muscles of hamsters and rats are generally similar, but their molar dentitions differ. The interlocking molar cusps of hamsters restrict propalinal protrusion and retrusion when the molars are in occlusion; however, hamsters readily unlock occlusion by a twisting movement in the horizontal plane. Rats may perform propalinal movements even with the teeth in occlusion. In mastication the hamster''s jaw moves laterally as well as vertically and anteroposteriorly. Chewing orbits typically reverse after 1-3 orbits. Reversal begins at the start of the upstroke and involves a lateral shift in the opposite direction with the mouth closed. Electromyograms show that symmetric and asymmetric activities of closing protrusive and closing retrusive muscles produce a unilateral force couple on both sides. (This couple accompanies a midline closing stroke). When the mouth is closed, unilateral activity of closing retrusors and closing protrusors also induces lateral translation. A bilateral force couple pits the retrusors of one side against the protrusors on the opposite side. Simultaneous with lateral excursion to the opposite side of midline and the action of these closing muscles, the anterior digastric and lateral pterygoid muscles of one side fire asymmetrically. The mandible moves downward coincidently with bilateral activity of the digastrics and lateral pterygoids. As the jaw opens further, activity differences of the lateral pterygoids accompany a shift of the mandible toward midline. At the end of the downstroke, all masticatory muscles studied are silent. The jaw returns to midline when the adductors fire asymmetrically at the start of closing. Trituration appears to coincide with an initial simple protrusion, which is subsequently accompanied by lateral translation. Different food types are reduced by distinct chewing patterns with the differences clearest when the teeth are near occlusion. During gnawing the lateral pterygoids and digastrics fire longer, and the closing muscles fire less strongly. Chewing patterns in golden hamsters appear more generalized than those of rats; the differences may be directly associated with the ability of hamsters to store food in their cheek pouches.