DIGESTION 

 FIG. 101 



203 



Meifsncr's Plants. 

 The sympathetic nerve-fabric as seen in and beJow the intestinal villi. (Ramon y Cajal.) 



and von Basch ascribe it, however, to 

 the vaso-constrictor action of these 

 nerves, but it has been shown that 

 the action is inhibitory after the cir- 

 culation has ceased. According to 

 Ehrmann, the sympathetic (splanch- 

 nics) are inhibitory to the circular 

 fibers, but motor to the longitudinal 

 fibers of the intestinal muscle. Re- 

 searches by Magnus indicate that 

 Auerbach's plexus controls the move- 

 ments of the circular muscular fibers 

 and has nothing to do with the longi- 

 tudinal movements. Removal of 

 Meissner's plexus did not affect the 

 peristalsis in an isolated loop of the 

 gut. A center for the movements 

 has been located by von Bechterew 

 and Mislawski in the sigmoid gyrus, 

 and this must be in close relation 

 with the centers which are concerned 



FIG. 102 



Meissner's plexus in the submucous layer 

 of the gut : a, ganglia; 6, cords of the plexus; 

 c, small bloodvessel. (Cadiat.) 



