Table 1.

Description of cranial nerve nuclei examined.

Name	Abbreviation	Plate derivation	Rhombomeric derivation	Days of peak neuronal generation #
principal sensory nucleus of the trigeminal nerve	PSN	alar	r2	G12 - 13
spinal trigeminal nucleus, oral subnucleus	SpVo	alar	r4	G13 - 14
spinal trigeminal nucleus, interpolar subnucleus	SpVi	alar	r6	G14 - 15
motor nucleus of the trigeminal nerve	MoV	basal	r2	G11 - 12
motor nucleus of the facial nerve	MoVII	basal	r4	G12 - 13
motor nucleus of the hypoglossal nerve	MoXII	basal	r8	G12 - 13

^#Data from Altman and Bayer (1980a; 1980b; 1980c) and Miller and Muller (1989).