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STUDIES IN ADVANCED PHYSIOLOGY. 



This is a capsule of connective tissue which extends entirely 

 over the liver, but which underneath extends in the form of 

 solid branched trabeculse up into the gland and forms the 

 framework of its inner structure . The point underneath where 

 this capsule of Glisson enters the liver is called the portal 

 fissure. These trabeculae of connective tissue are here rami- 

 fied through the interior, carrying in their ramifications 

 branches of the portal vein, the hepatic artery and the bile- 

 duct. If one should imagine a much-branched elm tree 

 covered with heavy canvas, and this canvas folded around 

 the main stem near the ground, and made, so to speak, 

 continuous with it, he would have an analogy to the struc- 

 ture of the liver, the canvas representing the capsule of 

 Glisson covering the entire gland, but at the portal fissure 

 connected with a system of ramifications extending through- 

 out the entire gland. If, now, we should imagine passing 

 through the stem, and through every branch of this tree, 

 even down to the finest twigs, three tubes running side by 



Fig. 118. LONGITUDINAL SECTION OF A PORTAL CANAL CONTAINING A PORTAL VEIN 



P. P.; TO THE RIGHT AND NEXT TO THE VEIN THE SMALLER BILE-DUCT; AND NEXT 

 TO THIS THE STILL SMALLER HEPATIC ARTERY. THE INDIVIDUAL LOBULES OF THE 



LIVER ARE PLAINLY SHOWN. (After Kieruau.) 



side, the analogy would be still more helpful. These tra- 

 beculse which run upward from the capsule of Glisson carry 



