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In the retinula cell of the honeybee drone, the response to light, recorded with intracellular micoelectrodes, consists of a graded depolarization. This potential change is probably caused by an increase in membrane permeability and by an ionic current flowing from the extracellular space into the retinula cell (1). In the drone, eight retinula cells are grouped together to form an ommatidium. The center of the ommatidium is occupied by the rhabdome, a compact arrangement of microvilli formed by the retinula cells (2). The rhabdome is thought to contain the photo pigment and, therefore, to initiate the response to light (3). In studying the distribution of diffusion tracers within the ommatidium, our purpose was to determine whether there are grounds to believe that the flow of current responsible for depolarization of the retinula cell passes through the membrane of the microvilli. The possibility that this was the case has been denied by a number of authors (4, 5), who have pointed out the compact arrangement of the microvilli and the presence of desmosomes around the rhabdome.

EVIDENCE FOR EXTRACELLULAR SPACE IN THE RHABDOME OF THE HONEYBEE DRONE EYE