Park Jong-Tae, Youn Kwan-Hyun, Lee Jae-Gi, Kwak Hyun-Ho, Hu Kyung-Seok, Kim Hee-Jin
Division in Anatomy and Developmental Biology, Department of Oral Biology, Human Identification Research Center, Brain Korea 21 Project, Yonsei University College of Dentistry, Seoul, South Korea.
J Craniofac Surg. 2012 Jan;23(1):195-7. doi: 10.1097/SCS.0b013e3182418e63.
Despite the importance of anatomic variations in the muscular bands around the orbicularis oculi muscle (OOc), little is known about them. The morphology and variations therein of the medial muscular band of the OOc were thus examined in the current study. Sixty-one hemifaces of Korean cadavers were dissected to enable examination of the anatomic organization of the muscles around the OOc. A medial muscular band of the OOc was observed in 40 cases (65.6%). Three patterns of attachment were found. In type A (14 cases, 23%), it attached to the frontal belly without being attached to the medial canthal tendon; in type B (14 cases, 23%), it originated from the medial canthal tendon at the lower portion of the OOc and inserted into the cheek skin, and in type C (12 cases, 19.7%), it was also observed to insert into the cheek skin and attach to the frontal belly without being attached to the medial canthal tendon. The distance between the inferior edge of the OOc and the subnasale was 16.3 (SD, 4.3) mm and 14.5 (SD, 4.4) mm in cases with and without a medial muscular band, respectively. A space was observed on the inferolateral side of the OOc in about 67.2% of cases. These findings regarding the medial muscular band of the OOc increase further the anatomic variations associated with this region. In addition, it appears that this medial muscular band of the OOc can help to prevent drooping of the OOc.
尽管眼轮匝肌（OOc）周围肌束的解剖变异很重要，但对此了解甚少。因此，本研究对OOc内侧肌束的形态及其变异进行了检查。解剖了61例韩国尸体的半侧面部，以检查OOc周围肌肉的解剖结构。在40例（65.6%）中观察到OOc的内侧肌束。发现了三种附着模式。在A型（14例，23%）中，它附着于额腹，未附着于内眦腱；在B型（14例，23%）中，它起源于OOc下部的内眦腱并插入颊部皮肤，在C型（12例，19.7%）中，也观察到它插入颊部皮肤并附着于额腹，未附着于内眦腱。有内侧肌束和无内侧肌束的情况下，OOc下缘与鼻下点之间的距离分别为16.3（标准差，4.3）mm和14.5（标准差，4.4）mm。在约67.2%的病例中，在OOc的下外侧观察到一个间隙。这些关于OOc内侧肌束的发现进一步增加了与该区域相关的解剖变异。此外，OOc的这一内侧肌束似乎有助于防止OOc下垂。
