ANATOMY OF SYMPATHETIC GANGLIA OF BLADDER. 113 



These smaller trunks are represented in fig. 2 as abruptly 

 truncated in some places; in reality, it is at these points that 

 the artery receives its nervous supply, tlie trunks being here 

 seen to enter the adventitia, where they fade away, and 

 gradually lose themselves. Tlic veins are not accompanied 

 by any such plexus of smaller nerves. 



In some preparations, chiefly from the bladder of the 

 rabbit, there is a somewhat simpler method of supply ; here 

 we cannot distinguish a large nerve-trunk, and an entwining 

 plexus of small nerves, but the artery is accompanied by a 

 ganglionated nerve-trunk, whence branches pass directly into 

 its adventitia. 



Figures 3 and 4 are drawn from a preparation of the 

 rabbit's bladder, showing this kind of arrangement. The 

 artery A in Fig. 3 is accompanied by a nerve-trunk, on Avhich 

 are situated the two ganglia i and ii, which are in reality 

 connected by the continuity of the trunks Bj and b^. A nerve- 

 trunk (supposed to be interrupted at the line ef) comes off 

 from ganglia i ; it enters the adventitia of the artery, and 

 disappears at a, where it almost meets a similar trunk 

 coming from ganglion ii. Ganglion i gives off another 

 trunk, which supplies the artery in a different manner. 



This is shown in fig. 4, b representing the nerve and 

 A the artery. The diminution in size, which may be 

 noticed in the nerve after it has crossed the artery, is due to 

 the loss of several of its fibres, which enter the adventitia of 

 the artery at a. 



The fact that nerves are found arising from ganglia, and 

 distinctly supplying arteries, is again illustrated in fig. 5. 

 A ganglionated nerve-trunk, not shown m the figure, runs, 

 roughly speaking, parallel with the artery (a) ; b, and Aj 

 the principal nerve-trunks of the artery, are connected with 

 two ganglia situated close together on this trunk. Where 

 b, reaches the artery it divides into two sets of fibres, one 

 of which passes superficial to, the other in the depth beneath 

 the vessel. The superficial division gives off a few fibres, 

 which enter the adventitia (a), and then divides into two 

 branches ; one of these loses itself in the adventitia on the 

 opposite border of the artery, the other ends by spreading out 

 into an irregular fan of nucleated fibres on the superficial 

 surface of the vessel. The nerve-trunk a^ also divides into 

 two branches, one of which terminates close to the last 

 described branch of Bp and in the same way, i. e. by 

 spreading out on the artery, and the other comes to an end 

 in the adventitia. The distribution of that part of B^ which 

 passes beneath the artery is unimportant ; it is connected 



