Table 1. Anatomical and electrophysiological references for model topology.

Neuron	Description	Neuroanatomy	Animal model & references
Pud	Pudendal afferents	Pudendal afferents enter the dorsal horn of the sacral spinal cord. Medial projections innervate the dorsal gray commissure (DGC) and lateral projections innervate the lateral edge of the dorsal horn.	rhesus monkey, cat (Roppolo et al. 1985; Thor et al. 1989)
Pel	Pelvic afferents	Pelvic afferents enter the dorsal horn of the sacral spinal cord. Pelvic afferents primarily make lateral projections along the lateral border of the dorsal horn.	rhesus monkey, rat (Nadelhaft et al. 1983; Roppolo et al. 1985; Sengupta and Gebhart 1994)
INM+	Excitatory interneuron	Interneuron that excites neurons in the sacral parasympathetic nucleus (SPN), located medial to the SPN.	cat, rat (de Groat et al. 1998)
INM-	Inhibitory interneuron	Interneuron that inhibits neurons in the SPN, located medial to SPN. GABAergic neurons project from DGC and dendrites from SPN have GABAergic receptors.	rhesus monkey, cat, rat (Nadelhaft et al. 1983; Nadelhaft and Booth 1984; de Groat et al. 1998)
IND	Excitatory interneuron	Interneuron along lateral edge of dorsal horn that receives input from peripheral nerve afferents and excites the SPN.	cat, rat (Araki and de Groat 1997; de Groat et al. 1998)
FB	Inhibitory feedback interneuron	Feedback interneuron that is controlled by output of SPN. This interneuron inhibits the dorsal interneuron and incoming peripheral afferents.	cat, rat (de Groat and Ryall 1968; de Groat 1976; Shefchyk 2001)
PMC	Pontine Micturition Center	Descending pathway from the PMC produces polysynaptic excitation of the SPN.	cat (Sasaki and Sato 2013)
SPN	SPN neuron (Pelvic efferent)	Neurons with cell bodies in the SPN make up the efferent pelvic nerve.	cat (de Groat et al. 1982; Sasaki 1998)