论文部分内容阅读
瞳孔是以虹膜为边缘围绕而成的一个圆孔。正常人瞳孔直径3～ 4毫米。由于年龄不同,各人瞳孔大小有差异,还可因种种外界和内在原因,时时发生变化,有时散得很大,有时又缩得很小,散大时直径大于5毫米,缩小时小于2毫米,瞳孔散大最大限度是直径8毫米,缩小最大限度是直径1.5毫米。瞳孔的大小是通过虹膜组织里的瞳孔括约肌和扩大肌的交替和互相制约作用来调节。括约肌受副交感纤维支配,扩大
The pupil is a circular hole surrounded by an iris edge. Normal pupil diameter of 3 to 4 mm. Due to different ages, pupil size differences, but also due to a variety of external and internal reasons, from time to time changes, sometimes scattered big, and sometimes shrink very small, scattered when the diameter greater than 5 mm, shrink smaller than 2 mm , Mydriasis is the maximum diameter of 8 mm, the maximum reduction is 1.5 mm in diameter. The size of the pupil is regulated by the alternation and mutual restraint of the pupil sphincter and the enlarged muscle in the iris tissue. Sphincter parasympathetic fibers dominated and expanded