主要内容 Main contents 体表投影 The surface projection °舌骨下区 The infrahyoid region >颈动脉三角 The carotid triangle >肌三角 The muscular triangle 胸锁乳突肌区 The sternocleidomastoid region主要内容 Main Contents • 体表投影 The surface projection • 舌骨下区 The infrahyoid region ➢颈动脉三角 The carotid triangle ➢肌三角 The muscular triangle • 胸锁乳突肌区 The sternocleidomastoid region