The frontal filaments comprise two regions, the internal vesicles and the external filaments. Dendrites of extra-optic protocerebral origin pass ventrally from the brain, some terminating within the lumen of the vesicles, others passing to the external filaments. Those dendrites within a vesicle have greatly swollen terminations from which two pairs of cilia arise. These cilia have well developed basal bodies, striated rootlets and a basal 9 + 0 fibrillar arrangement; they are also branched, the projections of a cilium being closely aligned.
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