in DIGESTION IN THE MOUTH AND STOMACH 199 



centres which act iu the same way and with more effect, on both 

 cardia and pylorus, causing the former to dilate, and moderating 

 the movements of the latter, without, however, causing it to open. 

 The efferent paths from these centres also run in the vagi. 



FIG. 60. Diagram of nerves and nerve centres that regulate movements of stomach. (Openehovvski.) 

 ' , bruin ; I", stomach ; MO, medulla oblongata ; MS, spinal cord ; 5-10, level of corresponding 

 dorsal vertebrae ; VSR, trunk of right vagus ; FS, trunk of left vagus ; XD, dilator nerve of 

 cardia ; NC, constrictor nerves ; r, plexus of Auerbach ; G, ganglia' described by Openchowski ; 

 S, S, tibres from sympathetic plexus, which are in relation with Auerbach's plexus. 1, Sulcus 

 crnciatus ; '2, corpus striatnm ; 3, corpora quadrigemina ; A", nucleus of vagus ; o, olive ; 4, 4, 

 spinal centres for orifice of cardia. The black lines represent the nerves to the cardia ; tin- 

 broken lines the nerves to the pylorus ; the broken and dotted lines the nerves to the fundus 

 and body of stomach. 



The principal cerebral centres for the movements of the 

 stomach lie in the posterior corpora quadrigemina, which influence 

 not merely the cardia and the pylorus, but also the entire body of 

 the stomach. Excitation of these produces a general constrictor 

 effect. The efferent fibres run for the most part in the vagi. 



