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. Author manuscript; available in PMC: 2013 Dec 26.
Published in final edited form as: Dev Biol. 2011 Jul 12;358(1):10.1016/j.ydbio.2011.07.006. doi: 10.1016/j.ydbio.2011.07.006

Fig. 4.

Fig. 4

Ultrastructural characteristics of larval photoreceptor terminals (lpt). A: 3D digital model of larval optic neuropil (LON, gray) and outer optic anlage (OOA, brown), dorso-posterior view. One photoreceptor terminal is shown (green). B: Model of LON and the same photoreceptor terminal as in A. Note varicose and bouton-shaped (bt) thickenings of photoreceptor terminal. Output synapses (sy) of this terminal are shown in magenta, bolwig nerve (bn). C: Statistics of the twelve lpt analyzed. D: TEM image of two adjacent bt of photoreceptor terminals, with synapse (sy; note characteristic T-bar and synaptic density, arrowhead). Other profiles in this image include optic lobe pioneer (OLP) and (uncharacterized) target neuron (tn). E, F: TEM images of photoreceptor terminal (shaded green), showing thin connector (cn) between adjacent boutons (bt). Arrowhead in F (magnified view of connector) points at array of microtubules. Note also profile of electron-dense glial cell (gl) adjacent to photoreceptor terminal and the epithelial cell (ep). Bars: Scale bars: 0.5μm (D), 1.5 μm (E), 0.2 μm (F).