460 A. B. MACALLUM. 



EXPLANATION OF PLATE XXXIII, figs. 1 to 6, 



Illustrating Mr. A. B. Macallum's Paper on "The Termination 

 of Nerves in the Liver.^^ 



All the figures are representations, as exact as possible, of the structures 

 drawn. 



Fig. 1. — A section of the edge of a lobule of the human liver to show the 

 course of the nerve-fibres. The clear spaces represent transverse and longi- 

 tudinal sections of the radial capillaries where they are continuous with the 

 interlobular capillaries, a. The coarse intralobular plexus, b. The perivas- 

 cular plexus, c. The intercellular fibrils, h. The hepatic cells. The capil- 

 lary walls are indistinguishable. Some of the larger nerve-fibres appear at 

 places to run over the liver-cells, but at these points they actually follow the 

 capillary pathways. Leitz, Oc. 3 and Obj. 7. The outlines of the cells, 

 nuclei, and fibres were drawn with camera. 



Fig. 2. — Two cells of the human liver, showing the termination of nerve- 

 fibrils in their interior. Leitz, Oc. 3, and oil immersion -^ inch. 



Fig. 3. — Shows the simple intracellular termination of nerves in the liver- 

 cells of Necturus. a. A larger nerve-fibre, h. An intercellular fibril, with 

 c, the perivascular plexus arising from a common fibre. Erlicki's fluid, gold 

 chloride, formic acid. Leitz, Oc. 3 and System 7. 



Fig. 4. — Shows the dendritic branching of a nerve-fibril in the interior of 

 a single hepatic cell of Necturus. Erlicki's fluid, gold chloride, formic 

 acid. Leitz, Oc. 3 and System 7. The branching of the fibril in the interior 

 of the cell was drawn with hom. imm. -^ inch. 



Fig. 5. — Two hepatic cells of Necturus with nerve-fibrils of the peri- 

 vascular plexus ; a fibril from the latter enters each of the cells and becomes 

 continuous with the cell reticulum. Erlicki's fluid, gold chloride, formic 

 acid. Drawn to the scale of Leitz, Oc. 3. and System 7 ; but the course of 

 the fibrils outlined as seen under hom. imm. ^ inch. 



Fig. 6. — A single hepatic cell of Necturus, showing the relations of nerve- 

 fibrils and the cell reticulum. The optical plane is above the nucleus and near 

 the upper surface of the cell. The nerve-fibril passes over the upper surface 

 of the cell, and gives off a branch which divides into twigs to penetrate the 

 cell and fuse with its reticulum. Erlecki's fluid, gold chloride, formic acid. 

 Tjeitz, Oc. 3, and oil imm. -jL inch. 



