The Fine Structure of the Dorsal Ocellus of the Fleshfly

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Abstract
The fine structure of the dorsal ocellus of the fleshfly (Boettcherisca peregrina) was observed by an electron microscope. The fleshfly has three ocelli on its frons. Three ocelli closely adjoined in their posterior parts, from which an ocellar nerve led to the brain. Each ocellus had about seventy retinula cells. A ring-like rhabdom was formed around the distal portion of the retinula cell. The retinula cell had a single proximal process, which made synaptic contacts with branches of the distal process of the second-order neuron just beneath the retina. A T-shaped synaptic ribbon was found at the synaptic locus of the retinula axon. Small vesicles were observed in. the terminal of the retinula axon. Each ocellus was innervated by only four second-order neurons. The ocellar nerve consisted of twelve distal processes of the second-order neurons and several small processes.

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