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2010). It is worth considering which muscles are innervated by motoneurones with different CRDP types. We start with the category with the largest number, the internal intercostal nerve motoneurones, and from these, first, the inspiratory group. The most natural assumption might be to assign these to the innervation of interchondral muscle, since in other species investigated interchondral muscle has always been reported as inspiratory. http://www.selleckchem.com/products/AZD0530.html However, it is noteworthy that all of the seven inspiratory CRDPs here were from anaesthetized animals, none from decerebrates, whereas for biphasic CRDPs, only 5/40 were from the anaesthetized animals versus 20/41 from the decerebrates (a significant difference, ��2, P http://www.selleckchem.com/products/GDC-0941.html during inspiration, similar to that seen for biphasic CRDPs. If the suggestion is correct, then there would be no special group here to be assigned to interchondral muscle. Perhaps this might have been expected. This part of the muscle is very small in T9 (absent in T10), comprising a narrow triangle between the last two costal cartilages, and quite distant from the sternebra (Greene, 1968). As far as we know, neither the electrical activity nor the mechanical properties of this part of the thorax have been investigated in any species. The expiratory CRDPs in the internal intercostal nerve motoneurones seem to form a more definitive group in that a reasonable proportion occurred in both the anaesthetized and decerebrate animals. Given the obvious association http://en.wikipedia.org/wiki/Diglyceride between the biphasic CRDPs and the biphasic activation of internal intercostal muscle (de Almeida et al. 2010), we suggest that the biphasic CRDPs belonged to motoneurones innervating intercostal muscle, while the purely expiratory motoneurones innervated abdominal muscles. Indeed, descriptions to date of respiratory activation of abdominal muscles in the rat, either from abdominal nerves or from EMG, have mentioned only expiratory phasing (Sherrey et al. 1988; Iizuka, 2003; Iizuka & Fregosi, 2007; Zoccal et al. 2008; Abdala et al. 2009), although some of the illustrations in Iizuka (2003) and in Zoccal et al. (2008) appear to include some inspiratory activation. In Figs 2 and 5 of Zoccal et al. (2008), the integrated version of the abdominal nerve record from the control population shows a discharge starting well within inspiration.