Table 1.

Respiratory spinal interneurons in mammals. These assessments were made in adult animals unless specified. Modified from Lane [104]. References to specific examples are indicated with an asterisk.

	Innervating	Spinal level	Subtype	Rostro-caudal distribution	Species	References
Electrophysiological demonstration	Phrenic motor system	Cervical		C1–C2	Cat	[105–109]
			Excitatory*	C1–C2	Rat	[110–114]
			Inhibitory*	C3–C5	Cat	[115–118]
				C3–C5	Rabbit	[119, 120]
			Excitatory	C4–5	Rat	[38, 40]
				C4–C6	Guinea Pig	[121]
	Intercostal motor system	Cervical		C1–C2	Cat	[105, 106]
			Excitatory*	C1–C2	Rat	[113, 122]
		Thoracic	Excitatory	–	Cat	[123–128]
	Expiratory motoneurons	Cervical		C1–C2	Cat	[129]
				C3–T9	Cat	[129]
Anatomical demonsration	Phrenic motoneurons	Cervical		C1–T4	Cat	[130]
				C1–C7	Ferret	[131]
			CholinergicV0C		Neonatal Mouse	[41]
			Excitatory		Neonatal Mouse	[45]
			Excitatory *V2a		Mouse	[8, 132]*
				C1–C7	Rat	[4, 47, 133]
			Inhibitory	C3–C5	Rat	[43, 44]
	Intercostal motoneurons	Cervical			Rat	[4]
	Abdominal motoneurons	Abdominal		T4–L4	Ferret	[134–136]