Goldberg R A, Lufkin R, Farahani K, Wu J C, Jesmanowicz A, Hyde J S
Division of Orbital and Ophthalmic Plastic Surgery, Jules Stein Eye Institute, Los Angeles, California 90024-7006.
Ophthalmic Plast Reconstr Surg. 1994 Jun;10(2):87-91.
Although the histologic anatomy of the lower eyelid retractors is well defined, the physiology of the lower retractors has been determined only by interference based on anatomic and clinical findings. In this study, in five normal subjects we investigated the physiology of the lower eyelid retractors utilizing dynamic high resolution magnetic resonance imaging (MRI) with a custom designed surface coil. Measurements of the excursion of the cornea, lower eyelid margin, and anterior edge of the inferior oblique muscle were made from scans taken in upgaze and downgaze. We found that the corneal movement was substantially greater than the movement of the eyelid margin, a finding that can readily be made clinically. A more important result was that the movement of the eyelid margin and the movement of the inferior oblique margin were similar in all cases. Thus, the length of the anterior capsulopalpebral fascia between the tarsus and inferior oblique muscle remains constant in downgaze, and the source of the stretch in the lower eyelid retractors lies in the posterior capsulopalpebral system, at the capsulopalpebral head. High resolution eyelid MR has great potential to allow investigation of essential aspects of normal and pathologic eyelid anatomy and physiology.
尽管下睑退缩肌的组织学解剖结构已明确，但下睑退缩肌的生理学仅通过基于解剖学和临床发现的干预来确定。在本研究中，我们对五名正常受试者使用定制设计的表面线圈，通过动态高分辨率磁共振成像（MRI）研究下睑退缩肌的生理学。从向上注视和向下注视时的扫描图像中测量角膜、下睑缘和下斜肌前缘的移动情况。我们发现角膜的移动明显大于睑缘的移动，这一发现很容易在临床上观察到。一个更重要的结果是，在所有情况下，睑缘的移动和下斜肌缘的移动相似。因此，睑板与下斜肌之间的前睑板囊筋膜在向下注视时长度保持不变，下睑退缩肌伸展的来源在于后睑板囊系统，即睑板囊头部。高分辨率眼睑磁共振成像在研究正常和病理性眼睑解剖学及生理学的关键方面具有巨大潜力。
