Type II muscles (22%) are visible and identifiable but, unlike the first group, insert into the periosteum and demonstrate little or no interdigitation with the orbicularis oris.
英
美
- 型(62%25),解剖中可见,并可被区分,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。