Table 2.

Unilateral Fos-like immunoreactivity neuronal counts in brainstem regions.

LEVEL	NUCLEI AND REGIONS	AGN/H
rostral to the obex		Control	ER
MEDULLA OBLONGATA
0.5 – 1.5 mm	NTS and adjacent border of 5SP	15 ± 2 (8–20)***	50 ± 4 (39–66)
0.5 – 1.5 mm	LRN, NA, NPA, FTL	22 ± 7 (6–52)**	73 ± 11 (30–105)
2 – 2.5 mm	LRN, NA, NPA, and adjacent FTL	13 ± 4 (5–28)**	39 ± 7 (21–58)
3 – 4 mm	FTL, medial 5SP and IFT, NA, NPA, RFN	14 ± 3 (9–23)** M	52 ± 11 (32–105)
4.5 – 5 mm	VN, dorsal part of FTL	19 ± 4 (7–30)**	42 ± 4 (32–55)
4.5 – 5.5 mm	RFN, LRN, ventral FTL, caudal VII & RTN	11 ± 4 (0–27)***	59 ± 7 (35–80)
PONS VAROLI
7 – 8 mm	Raphe	8 ± 2 (4–15)*	2 ± 2 (0–8)
10 mm	NPBL, KF	10 ± 2 (7–15)*	19 ± 3 (11–30)
MESENCEPHALON
12.5 – 13.5 mm	PAG lateral to Aqueduct	78 ± 15 (37–120)* W	38 ± 6 (10–48)
17 – 18 mm	Midline area	76 ± 10 (40–102)**	131 ± 11 (98–153)

The average group number of FLI neurons in a particular area/hemisection (AGN/H), the range of the counts in brackets, and significant differences (*, p<0.05; **, p<0.01; ***, p<0.001) between the non-stimulated (Control) and stimulated group of cats (ER) are shown. Unpaired t-test, Welch corrected unpaired t-test (W), and Mann-Whitney test (M) were used for statistical processing. 5SP, parvocellular division of the alaminar spinal trigeminal ncl; FTL, medullary lateral tegmental fields; IFT, infratrigeminal ncl; KF, Kölliker-Fuse ncl; LRN, lateral reticular ncl; NA, ambigual ncl; NPA, paraambigual ncl; NPBL, lateral parabrachial ncl; NTS, solitary tract ncl; PAG, periaqueductal grey; RFN, retrofacial ncl; RTN, retrotrapezoid ncl; VII, facial ncl; VN, vestibular nuclei.