家蝇复眼小网膜的超微结构

THE ULTRASTRUCTURE OF THE RETINULA IN THE COMPOUND EYE OF THE HOUSEFLY

用电子显微镜研究了家蝇(musca domestica)复眼小网膜的一般结构,特殊结构和小网膜细胞的对称性排列,并比较了在暗适应、明适应和强光适应状态下小网膜细胞的结构。家蝇复眼的每个小网膜一般由八个小网膜细胞组成,某些小网膜是由六、七、九和十个小网膜细胞组成。家蝇的左复眼与右复限、复限的背区与腹区中,小网膜细胞呈镜像对称排列。另外,在复眼的背区或腹区中,有的小网膜细胞之间也呈镜像对称排列。家蝇复眼在强光适应状态下,No.1~6小网膜细胞内大部分色素颗粒移动到感杆(rhabdomere)附近,而No.7~8小网膜细胞内色素颗粒一般不移动,但有些No.7~8小网膜细胞内色素颗粒也有移动。

The common,particular structure and the arrangement pattern of the retinula in the compound eye of the housefly Musca domestica have been investigated,and the structures of the retinula cells here been compared with an electron microscope under dark,bright and high intensity light adaptation condition.In general,the retinula of the compound eye is composed of eight retinula cells,but some retinula is composed of six,seven,or nine,ten retinula cells.The arrangement pattern of the retinula in the right,left compound eye and dorsal,ventral regions of the compound eye are the mirror image inversion.But the arrangement pattern of some retinula in the dorsal or ventral region is also the mirror image inversion.The greater part of pigment granules in the retinula cells No.1~6 move towards the rhabdomere,the pigment granules in the retinula cells No.7~8 do not move,but the pigment granules in the some retinula cells No.7~8 move towards the rhabdomere under high intensity light adaptation condition.