Figure 10.

Reconstructions of the innervation of the left (ipsilateral) DCN by axonal processes arising from three On-C cells. The outlines of the DCN are included to indicate orientation; they are shown for a very constrained rostrocaudal segment of the nucleus, whereas the flattened three-dimensional tracing of the whole of the DCN innervation is shown. In all three examples, the axonal termination occupies approximately one-third of the mediolateral extent of the nucleus while extending across virtually its entire dorsoventral thickness. In our current data, all but the most superficial part of DCN receives afferent input from On-C type neurones. A DCN termination of unit 249. The majority of the axonal termination is in the ventrolateral part of DCN. Neurones recorded in this part of DCN generally exhibit low BFs. B DCN termination of unit 212. The majority of the termination is in the central region of DCN, which is associated with middle-frequency neurones in DCN recording studies. C The DCN termination of unit 282 also occurs in the central region of the nucleus but is more restricted than the termination of unit 212. In these tracings, as in Figure 9, neuronal processes are rendered with their thickness correctly proportioned. Scale bar = 1000 μm.