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眼轮匝肌.
眼轮匝肌(orbicularis oculi)为椭圆环形而围绕眼裂外周的肌肉,分为眶部、睑部、泪囊部;其睑部是构成眼睑的主要肌肉,能产生闭眼的动作。
眼轮匝肌起源于鼻部分的额骨,从额上颌骨前的泪沟开始,包括眼睑内侧韧带,形成了一个广泛的薄层。眼睑的一部分肌肉较薄且为白色,源自不同的眼睑内侧韧带,并形成一系列同心曲线,插入到侧睑中缝的眼部外眼角中。内环部分较厚和且为红色,它的纤维形成一个完整的椭圆没有中断。在侧眼睑的连合纤维区域,上部的这部分配合額肌和皱眉肌。
卧蚕是一条4-7毫米紧临下睑缘的带状隆起,主要因眼轮匝肌的下睑板前部(inferior pretarsal portion)局部肥厚形成;因其横卧眼下,形似家蚕幼虫而得名。个体有无卧蚕主要和遗传有关。卧蚕在微笑或表情变化时,因肌肉收缩会更加明显。
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頭部和頸部的肌肉示意圖
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臉部和頭皮的動脈
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右眼窩的矢狀切面
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上眼瞼的矢狀切面
本條目包含來自屬於公共領域版本的《格雷氏解剖學》之內容,而其中有些資訊可能已經過時。
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