Skip to main content
. Author manuscript; available in PMC: 2022 May 2.
Published in final edited form as: Diversity (Basel). 2021 Aug 7;13(8):364. doi: 10.3390/d13080364

Figure 2.

Figure 2.

Neurons require Neurog expression. Lancelets have a limited description of bHLH genes that are characterized in the more caudal spinal cord, which is positive for Neurog. Note that the lancelet has no Atoh bHLH gene. Ciona has at least 6 bHLH genes expressed in sensory cells that are innervated by bipolar tail neurons which extend to reach the visceral ganglion for interactions. Atoh and Neurog genes are described in Ciona associated with the spinal cord. Vertebrates have dorsal root ganglia that depend on Neurog1/2, which is also expressed in Atoh1 and Neurog1 of the spinal cord. The brainstem is innervated by electroreceptor (ELL) and lateral line fibers (LL) that extend to innervate migration populations of LL and some ELL). The ear is unique in vertebrates, which give rise to the VIII ganglia that innervate more ventral nuclei compared to LL and ELL projections to reach Atoh1. CP, choroid plexus. Modified after [2,7,12,23,24].