Tyrosine hydroxylase immunoreactivity in the deutocerebrum and medial antennal lobe tract.

<p>Tyrosine hydroxylase (TH) immunoreactivity is shown in magenta (A, D, G, J) and synapsin immunoreactivity in green (B, E, H, K). Corresponding merged images (C, F, I, L). <b>A-C</b>: Frontal sections through the antennal lobe (AL). Insets indicate single optical slice (< 2 μm thickness) of the three glomeruli, which are marked by asterisks in main panel B. TH-positive fibers innervate antennal lobe glomeruli, predominantly the peripheral areas (see arrowheads in inset of A). In the macroglomerular complex (MGC), TH-positive fibers innervate exclusively the medial side (arrows in A). <b>D-F</b>: Horizontal sections through the antennal lobe. A single TH-positive multiglomerular projection neuron (PN) is labeled, which projects its axon toward the medial antennal lobe tract (MALT, see also panel G). <b>G-I</b>: Frontal sections through the medial antennal lobe tract containing several TH-positive axons (arrowheads). <b>J-L</b>: Frontal sections through the lobus glomerulatus (LG) and the antennal mechanosensory and motor center (AMMC). TH-immunoreactive fibers are widely distributed in the AMMC. In the lobus glomerulatus, immunoreactive fibers predominantly innervate the ventral portion. D, dorsal; M, medial; ML, medial lobe; NO, noduli; P, posterior; PB, protocerebral bridge. Scale bars = 50 μm in inset of C; 100 μm in C, F, I, L.