ANATOMY OF SYMPATHETIC GANGLIA OF BLADDER. Ill 



ganglion is made up of fibres passing in different directions, 

 which form the means of communication between the different 

 nerve-trunks ; around this fibrillar core the ganglion cells 

 are arranged, and Avith it their processes are incorporated. 

 Contiguous nerve-trunks often communicate with each other 

 by fibres which do not pass through the ganglion, but 

 which form a peripheral meshwork, as at the smaller end of 

 ganglion i in fig. 3. When the ganglia are not thus situated 

 at points of intersection and interchange, they are found to 

 be connected, as before stated, with single nerve-trunks. 

 The simplest form of ganglion is that figured by Dr. Klein 

 in the Handbook, where the nerve-trunk is enlarged at one 

 place by a group of ganglion cells lying among its fibres. In 

 other cases the number of cells is greater, and the ganglion 

 presents the appearance of a cluster of cells traversed by a 

 nerve-trunk ; there is a variety of this arrangement in which 

 part of a nerve-trunk forms the axis of a ganglion, Avhile the 

 remainder of the fibres pass close underneath the ganglion 

 without being connected with it. Lastly, a ganglion may be 

 situated on a nerve-trunk at its point of departure from a 

 larger one, and in that case usually receives recurrent fibres 

 coming from the parent trunk beyond the point of division. 



The ganglion cells are of irregular spherical and ovoid 

 shapes, and are about 0'02 mm. in length ; they are made up 

 a finely granular substance, and contain a single vesicular 

 nucleus (or two nuclei), which is usually eccentric, and 

 always contains a large shining nucleolus. All the cells 

 whose processes can be distinguished are unipolar ; fig. 6 

 shows a number of such pear-shaped cells forming a small 

 ganglion ; also the nucleated capsule in which each cell is 

 contained. 



In many of my preparations these ganglia possess a special 

 system of blood-vessels, small arteries, and capillaries. In 

 one of them there is a small artery running along one border 

 of a very large ganglion ; it gives off branches, which accom- 

 pany the principal nerve-trunks arising from the ganglion, 

 and also two branches for the blood supply of the ganglion ; 

 one of these passes up on the right, the other on the left, of 

 the ganglion ; they curve round to the upper border of the 

 ganglion, so that it is nearly surrounded in an arterial circle. 

 Of the branches given off from this circle, some anastomose 

 with capillaries running with the nerve-trunks of the 

 ganglion, and others pass into the ganglion and supply it. 

 In many cases the ganglia are surrounded by networks of 

 capillaries ; an example of this arrangement may be seen in 

 fig. 3. It will be noticed that the nerve-trunks belonging to 



