A comparative analysis of the distribution of immunoreactive orexin A and B in the brains of nocturnal and diurnal rodents

Table 1 Orexin cell body distribution

Brain region	LE rat		Grass rat		Hamster		Degu
	A	B	A	B	A	B	A	B
Dorsal hypothalamic area	+	+	+	+			++	++
Dorsomedial hypothalamic nucleus	+++	++	++	++	++	++	++++	++++
Lateral hypothalamic area	+++	+++	+++	+++	++++	++++	++++	++++
Paraventricular hypothalamic nucleus, magnocellular	+++	-	++++	-	-	-	-	-
Perifornical nucleus	++++	++++	++++	++++	+	+	++	++
Posterior hypothalamic area	++	++	+++	+++	-	-	++	++
Retrochiasmatic area	+	+	+	+	-	-	+	+
Subincertal thalamic nucleus	+	+	++	+	+	+	+	+
Supramammillary nucleus		-		-	-	-	+	+
Supraoptic nucleus	++++	-	++++	-	++	-	-	-
Supraoptic nucleus, retrochiasmatic	++	-	+++	-	+	-	-	-
Tuberum cinerum	++	++	+++	+++	+	+	++	++

Distribution of orexin A and B cell bodies in the Long-Evans rat, grass rat, Syrian hamster, and degu. The relative densities of OXA- or OXB-containing cells are indicated in each column as very dense (++++), dense (+++), moderately dense (++), sparse (+), or absent (-).