Table 2.

Embryological origin of commissural interneurons

Cell Type	Location	Projection	Transmitter	Transcription Factor	Contralateral Terminations	Action	References
dI5	VI	contralateral	Glutamate	Lmx1b	dorsal horn	?	Lu et al. (2015); Vallstedt and Kullander (2013)
dI6	VII–VIII	contralateral	GABA/glycine	Dmrt3	VII–IX, MN	Control of gait	Andersson et al. (2012); Dyck et al. (2012)
V0D	VII–VIII	contralateral	GABA/glycine	Dbx1	VII–IX, MN	Coordination of left–right alternation at low speed	Talpalar et al. (2013)
V0V	VII–VIII	contralateral	Glutamate	Dbx1	VII–VIII	Coordination of left–right alternation at high speed	Talpalar et al. (2013)
V0C	VII, X	contralateral/bilateral	Acetylcholine	Dbx1	IX, VII, MN	Modulation of motoneuron firing frequency	Stepien et al. (2010); Zagoraiou et al. (2009)
V3	VII	contralateral/bilateral	Glutamate	Nkx2.2	VII–IX, MN	Control of rhythmicity	Briscoe et al. 1999); Zhang et al. (2008)

Roman numerals refer to laminae of Rexed. MN, contacts on contralateral motoneurons; ?, unknown action.