Table 3. A Summary of the Physiological and Behavioral Action of the Different Serotonin Receptor Subtypes as Well as Their Distribution in Type I, II, and III Neurons.

Receptor	Physiological action in the BNST	Cell type distribution (Hazra et al, 2012)			Behavioral action
		I	II	III	BNST	CNS
5-HT1A	Hyperpolarization (GIRK channels)	63%	32%	41%	Anxiolytic (Levita et al, 2004; Gomes et al, 2011)	Anxiolytic (Albert et al, 2014)
5-HT7	Depolarization (Gs receptor)	55%	44%	0%	Unknown	Depressive (Mnie-Filali et al, 2011)
5-HT2C	Depolarization (Gq receptor)	5%	0%	59%	Anxiogenic (Heisler et al, 2007; Marcinkiewcz et al, 2015)	Anxiogenic (Heisler et al, 2007; Kimura et al, 2009)
5-HT1B	Presynaptic inhibition	0%	21%	41%	Unknown	Aggression and impulsivity (Saudou et al, 1994; Nautiyal et al, 2015)