Figure 6.

Migration modes during PN assembly. After the tangentially migrating PN neurons arrive at the ventral midline, they switch their migratory mode and/or direction. (A) Early arrived PN neurons partially migrate radially contributing to the core of the PN, including the neurons of the RTN, or switch their migration laterally below the surface (Shinohara et al., 2013). (B) Late PN neurons rarely migrate radially, but mostly migrate laterally and stack onto progressively forming layers of PN neurons and therefore mainly contribute to the BPN (Shinohara et al., 2013). BPN: basal pontine nucleus, PN: pontine nuclei, RTN: reticulotegmental nucleus.