Objective: To evaluate anatomical features of lacrimal fossa and nasal cavity via bodies, dissection and their applicationin lacrimal sac, s operation. Materials and methods: We dissected and measured on 30 bodies at the anatomy faculty of Medical University of Ho Chi Minh city. Results: These are the figures: width of the larcimal fossa (LF): 4, 5 mm ± 0, 3.