的细胞体、感杆和轴突较大，它与外周小网膜细胞R_（1～6）相同，其轴突终止在第一视神经节（薄板）；
R_(7a) approximate many features of R_(1-6) cells, which have a larger, cell body, rhabdomere and axon, terminate in the first optic neuropil (lamina).
伸缩式挂衣杆由内节杆（3）和外节杆（4）组成，外节杆插于内节杆之中。
The telescopic clothes hanging rod is composed of an inner segment rod (3) and an outer segment rod (4), and the outer segment rod is inserted in the inner segment rod.
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