Hur Mi-Sun
Department of Anatomy, Institute for Clinical and Translational Research, Catholic Kwandong University College of Medicine, Gangneung, Korea.
J Craniofac Surg. 2017 Oct;28(7):1861-1864. doi: 10.1097/SCS.0000000000003777.
The current study examined the inferior bundle of the incisivus labii inferioris muscle (ILI) and its morphologic and spatial relationships with regard to the depressor labii inferioris muscle (DLI) and the platysma. Incisivus labii inferioris muscles and their inferior bundles were investigated in 50 specimens from embalmed Korean adult cadavers. The inferior bundle of the ILI was divided from the originating fibers of the ILI, and it was present in all specimens (100%). The inferior bundle of the ILI could be distinguished into the transverse and inferolateral slips according to their courses and locations. The inferior bundle of the ILI was classified into 3 types according to the presence of the transverse and inferolateral slips. In Type I (44%), the inferior bundle of the ILI had both the transverse and inferolateral slips. In Type II (48%), the inferior bundle of the ILI had only the transverse slip. In Type III (8%), the inferior bundle of the ILI had only the inferolateral slip. The transverse and inferolateral slips were usually attached to the deep fibers of both the platysma lateral to the DLI and the lateral portion of the DLI via aponeurosis, just below the ILI and above the inferior margin of the mandible, respectively. The new anatomical findings of the present study might contribute to the understanding of the detailed movements required to raise the lower lip. This knowledge will be useful for botulinum toxin type A therapies, various facial surgeries, orthodontic treatment, and electromyographic analyses in this area.
本研究对下唇降肌（ILI）的下束及其与降下唇肌（DLI）和颈阔肌的形态学及空间关系进行了研究。在50例防腐处理的韩国成年尸体标本中对下唇降肌及其下束进行了研究。ILI的下束由ILI的起始纤维分出，所有标本（100%）均有该下束。ILI的下束根据其走行和位置可分为横行束和下外侧束。ILI的下束根据横行束和下外侧束的存在情况分为3种类型。I型（44%）ILI的下束既有横行束又有下外侧束。II型（48%）ILI的下束只有横行束。III型（8%）ILI的下束只有下外侧束。横行束和下外侧束通常分别通过腱膜附着于DLI外侧颈阔肌的深层纤维以及DLI的外侧部分，分别位于ILI下方和下颌骨下缘上方。本研究的新解剖学发现可能有助于理解下唇上抬所需的详细运动。这些知识将有助于A型肉毒毒素治疗、各种面部手术、正畸治疗以及该区域的肌电图分析。
