Figure 7. Network model for the control of laryngeal motoneurones.

Schematic diagram of ventrolateral medullary respiratory neuronal network connections and hypothesized inputs from nucleus tractus solitarius (NTS) cough receptor second-order neurones and pulmonary stretch receptor (PSR) Pump cells. Neurone connections onto ILM and ELM arise from the ‘core’ network (enclosed by dashed-line box). E-Aug Early and E-Aug Late, neurones that begin discharging prior to and during the latter part of the expiratory phase, respectively. I-Driver, inspiratory neurone also active before the expiratory-inspiratory phase transition and with a relatively constant discharge rate throughout the inspiratory phase (I-Plat); definition specifically limited to BÖT/rVRG neurones with previously identified excitatory functional links to other inspiratory neurones (Balis et al. 1994). Other abbreviations are described in detail in the text. For a detailed description of the ‘core’ (excluding ILM and ELM) of the model, see Shannon et al. (1998, 2000). The connections with asterisks and question marks represent those inferred from the results of this study.