

GLANDS. 135 



upon its surface, the intersection of which gives it a 

 honey-combed appearance ; it is lined by a cylindrical 

 epithelium, composed of yellowish colored cells, which 

 are very pale and often destitute of nuclei (PL XXII. 

 fig. V.). 



The liver has two sets of lymphatics : one super- Lymphatics. 

 ficial, ramifying in the thickness of its proper coat ; 

 the other deep, and following the subdivisions of the 

 portal vein ; they anastomose freely with each other, 

 and terminate, those from the convex surface of the 

 organ, by passing upwards through the thoracic 

 cavity, and those from its inferior surface, by running 

 into the lymphatic glands of the abdomen. 



The nerves of the liver, which are derived from the 

 pne in no-gas trie and great sympathetic, join the hepa- 

 tic artery and follow its ramifications ; but their mode 

 of termination in the interior of the lobules is un- 

 known. 



The first traces of the liver make their appearance Development. 

 in the shape of two little masses of cells, one upon 

 the outer, the other upon the inner or epithelial layer 

 of the intestinal wall. As to their subsequent meta- 

 morphoses, what has been ascertained by the most 

 reliable einbryologists may be stated as follows: 

 Whilst the more external of the two cellular masses 

 enlarges and surrounds the common trunk formed by 

 the umbilical and portal veins, constituting thus a 

 parenchymatous mass enclosing the portal system of 

 veins which are closely enveloped by large sized 



geously consulted by the student ; they contain much valuable informa- 

 tion as to injecting and preparing specimens of the liver for micro- 

 scopical study. (Ed) 



