... at late stages of development (Fig. 2E,F), and Dil retrograde labelling of cranial nerve roots (Lumsden and Keynes, 1989) shows the apparently stereotyped pathways taken by motor axons in odd-numbered rhombomeres to reach their exit point in the rostrally adjacent rhombomere. The development...

.... Scale bar=160 μ m. At stage 17, motor neurons have a characteristic distribution in the chick hindbrain (Lumsden and Keynes, 1989). Retrograde dye labelling of cranial nerve roots shows that the neurons of the trigeminal nucleus are located in r2 and r3, exiting from r2, while those...