顶突（rostellum）亦称额、小喙。系绦虫类固着器之一，为可从头节前端出入的结构。
染色观察都匀牛带绦虫10个头节中有3个明显可见发育不良的顶突。
Rudimentary rostellum was found obviously in 3 of 10 scolices of the worms from Duyun.
日本血吸虫毛蚴：顶突呈网格状，上有2个穿刺腺开口及4—6根短纤毛。
The miracidiumof the Schistodoma japonicum:The apical papilla possesses a net-like structure with 2 apical gland openings and 4-6 short cilia.
结果表明，豆状囊尾蚴和豆状带绦虫均有4个吸盘，37个小钩分内、外两圈排列在顶突上。
There were 4 suckers in C. pisiformis and the scolex of T. pisiformis, and 37 hooks in the rostellum arranging with inner and outer rings.
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