Copy, Diaht Lanai 7-AAIr denartment nf Anatamu udon I Ini// 二腹肌前腹 面动脉 anterior belly of facial a 下颌下三角 pressor anguli oris submandibular triangle 面动脉 posterior belly of- 腹肌前腹 nterior belly of digastric 内静脉 internal jugular v. 甲状舌骨肌 of omohyoid 胸锁 环甲肌 臂丛 肩胛舌骨肌下腹 brachial plexus 锁骨上三角 supraclavicular lymph nodes 胸骨舌骨肌 胸骨甲状肌 sternohyoid sternothyroid 胸骨舌骨肌 Infrahyoid mi infrahyoid mm superficial layer (deep layer) Copy Right- Hongqi ZHANG-Department of Anatomy-Fudan UniversityCopy Right- Hongqi ZHANG-Department of Anatomy-Fudan University Copy Right- Hongqi ZHANG-Department of Anatomy-Fudan University Infrahyoid mm. （superficial layer ） Infrahyoid mm. （deep layer ）