目的　为下颌下腺移位于颏下间隙预防头颈部放疗后口干燥症提供解剖学基础。 方法　30侧经颈外动脉灌注红色乳胶的正常成人头颈部标本，在2.0~3.0倍的便携式手术显微镜下对下颌下腺及血管进行显微解剖，观测下颌下腺腺体的体积、下颌下腺导管的长度及腺体周围动静脉腺支血管的走行、分布、毗邻关系等显微解剖特点。 结果　下颌下腺以下颌舌骨肌后缘为界分为较大的浅部和小的深部。浅部体积为（1.7±0.5）cm3；深部为下颌下腺的延长部分，体积为（1.0±0.8）cm3。下颌下腺导管由下颌下腺浅部的深面发出，长约5cm，开口于舌系带旁的舌下肉阜。 结论　下颌下腺移位于颏下间隙预防头颈部放疗后口干燥症的手术具有可行性。

Objective　The purpose of this study was to provide an anatomical basis for prevention of post-irradiation xerostomia by submaxillary gland transposition in the submental region.　Methods　Under the portable operating microscope with 2.0~3.0 magnification, we dissected submandibular gland (SMG) and blood vessels of 30 specimens of normal adult head and neck through the external carotid artery with red latex and observed morphology of the submandibular gland, length of submandibular gland duct and course, distribution, adjacent relations,et al. of gland arteriovenous gland vessels.　Results　The submandibular gland was divided into two parts - shallow and deep , to the limit of posterior margin of mylohyoid muscle, the shallow part about (1.7±0.5) cm3 , the deep about（1.0±0.8）cm3  which was the extension for the submandibular gland. The submandibular gland ducts were from the submandibular gland deep issue, about 5 cm, opening in the sublingual caruncle on the side of the lingual frenulum.    Conclusion    This result is of reference value for prevention of post-irradiation xerostomia by submaxillary gland transposition in the submental region.