466 



NERVES OF ALIMENTARY CANAL. [BOOK n. 



motor nerve is stimulated as with the beats which may be called 

 forth in an inhibited or otherwise quiescent heart by stimulation 

 of the cardiac augmentor fibres. 



RV 



Ret. 



FIG. 70. DIAGRAM TO ILLUSTRATE THE NERVES OF THE ALIMENTARY 



CANAL IN THE DOG. 



The figure is for the sake of simplicity made as diagrammatic as possible, and does 

 not represent t]i<- /inntoinical relation*. 



Oe to Ret. The alimentary canal, oesophagus, stomach, small intestine, large 

 intestine, rectum. 



LV. Left vagus nerve, ending on front of stomach, r.l. recurrent laryngeal nerve 

 supplying upper part of oesophagus. E.V. right vagus, joining left vagus in 

 cesophageal plexus, oe. pi., supplying the posterior part of stomach and con- 

 tinued as R'.V. to join the solar plexus, here represented by a single ganglion and 

 connected with the inferior rnesenteric ganglion (or plexus) in. gl. a. branches 

 from the solar plexus to stomach and small intestine, and from the mesenteric 

 ganglion to the large intestine. 



Spl. maj. Large splanchnic nerve arising from the thoracic ganglia and rami 

 communicantes r.c. belonging to dorsal nerves from the 6th to the 9th (or 10th). 



S})!. min. Small splanchnic nerve similarly arising from 10th and llth dorsal 

 nerves. These both join the solar plexus and thence make their way to the 

 alimentary canal. 



C.r. Nerves from the ganglia &c. belonging to llth and 12th dorsal and 1st and 

 2nd lumbar nerves, proceeding to the inferior mesenteric ganglia (or plexus) 

 m. gl. and thence by the hypogastric nerve n. hyp. and the hypogastric plexus 

 pi. hyp. to the circular muscles of the rectum. 



l.r. Nerves from the 2nd and 3rd sacral nerves, S2, S3 (nervi erigentes), proceed- 

 ing by the hypogastric plexus to the longitudinal muscles of the rectum. 



