Type I depressor septi muscles(62%) are visible and identifiable, and can be traced to full interdigitation with the orbicularis oris from their origin at the medial crural footplate.

• 型降鼻中隔肌（62%25），解剖中可见，可被识别，并发现在其起始部位内侧脚踏板处和同起于此的口轮匝肌完全交错。