THE ALIMENTARY TRACT. 



291 



lacteals are not simple but in the form of a coarse network (Fig. 

 189), (Langer).] 



(7) [The nerves of the Fig- 19- 



small intestine (p. 200) usu- 

 ally follow the arteries to 

 the muscular coats, between 

 which thev form a plexus 

 (Auerbaeh's plexus) ; from 

 this numerous twigs are 

 given off, which course alone 

 or in company with vessels 

 to the mucous coat, where 

 a second plexus (Meissner's 

 plexus) is formed. Auerbaeh's 

 plexus, according to Klein, consists of bands of nervous fibrils in 

 endothelial sheaths ; they branch and inosculate, and thus form a 

 plexus. "Where several such branches 

 meet, a more or less complicated decus- 

 sation of the bands of fibres takes place. 

 Along these nervous bands are ganglion 

 cells, either isolated or in groups. The 

 cells are large, generally spherical, and 

 contain a sharply outlined nucleus with 

 a single or double nucleolus. The 

 smaller cells generally appear to p' - - 

 only one process, which can be traced 

 from the protoplasm of the cell between 

 the fibrils of the nerve-trunk. The 

 larger cells are distinctly multipolar, 

 their protoplasm being provided with a 

 number of fine processes, or, as is 

 oftener the case, with one large and 

 several small pro- . In many in- 

 stances Klein was able to distinguish 

 around the ganglion-cells a capsule of 

 a spherical or ovoid shape. In these 



- the body, as well as the pro 

 of the ganglion-cell, were lying within 

 the capsule. This system of ganglion- 

 cells is in connection with the individual 

 bundles within the nerve-trunks. 



Isolated fold of mucous membrane of small intestine 

 of Rana lemporaria ; after Longer. Forty times 

 natural size. Blood-vessels striped, lacteals shaded. 



Fig. TQT. 



-A 



B 

 C 



Transverse section of a fold of the 

 mucous membrane of Rana tftapo- 

 raria ; after Langer. Sixty times 

 natural size. 



A 



Lacteals with transverse trabe- 



culae. 



Circular muscular layer. 

 Longitudinal muscular layer. 



Blixl- vessels striped. 



r - 



