玉米穗螟雌成虫表皮的透射电子显微镜图片 Transmission Electron Micrograph of Insect Cuticle-Adult female of Heliothis zea Epicuticle Exocuticle Procuticle Endocuticle Epidermal cell Cell nucleus Basement membrane http://www.faculty.ucr.edu/~insects/pages/teachingresources/files/INTEGUMENTARY SYSTEM1.pdf