73 



nerve of that side (fig. TO, Post. Fun. N .). It is not so 

 stout a nerve as the visceral. Piercing the posterior 



wall of the cranial cavity, external to this nerve, it runs 

 oni to the postero-dorsal wall of the funnel (fig. 69, Post. 

 Fun. A'.). Next it penetrates the visceral envelope and 

 runs for a short time mi the inner wall of this structure, 

 and then returns to its outer side (PI. X, fig. 82). Then 

 it runs out to the funnel and innervates its posterior 

 region, splitting- into three main forks (fig. 69):— -(1) A 

 fine anterior strand which running forwards splits up 

 into several branches innervating the funnel wall; (2) a 

 stouter median branch which ends similarly, just behind 

 the above; and (3) a posterior strand, which innervates 

 the depressor muscle of the funnel. 



B. (5) The Visceral Nerves are very long and 

 stout. Much of their course may be followed by removing 

 the septal muscle, and also the epithelial cover of the 

 visceral mass, as they inn over the ventral surface of the 

 liver. The visceral nerve is given off from the posterior 

 surface of the visceral ganglion, at its external and ventral 

 angle (tig. 70, Vise. X .). Piercing the membranous 

 posterior wall of the cranium, it reaches the inner surface 

 of the visceral envelope (fig. 82, Vise. X.), courses along 

 the inner surface of the visceral envelope, just to one side 

 of the median line, runs over the anterior surface of the 

 liver, ami gains its ventral surface. In tig. 00, Vise. N., 

 it may be seen on the ventral side of the visceral envelope, 

 which it has pierced. It is now separated from its fellow 

 by the anterior vena cava, alongside' which the visceral 

 nerve runs for some time. Further back the visceral 

 nerves are also separated by the rectum, which lies on the 

 right side of the vena cava (fig. 00, /(*.). At the level of 

 the anterior edge of the kidney, the visceral nerves begin 

 to slope away from one another, each running out towards 



