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.