Fig. 10. The septum viewed from Eng’s side. A. The orifice of the umbilical pouch of Eng. B. The orifice of the hepatic pouch of same. C. Suspensory ligament of Eng containing the umbilical pouch of Chang.
3. The vascular structures of the band were as follows:—
The livers being united, it was found that a colored injection thrown into the portal vein of Chang passed into the liver of Eng. A careful dissection of the blood vessel[blood vessel] (Fig. [11], C) proved it to be a terminal twig of the portal system of Chang. It was of the thickness of a No. seven catheter, French scale, gradually diminished in size, and was lost toward the centre of the band. It did not pass as such across the band, but appeared to break up into minute branches before reaching the liver of Eng. At the same time there was undoubted distension of the portal capillaries with the colored fluid under the capsule of the dorsal surface of the right lobe of Eng’s liver, one and one-half inches from the band. Examination of the branches of the mesenteric veins of Eng revealed the curious fact that some of them had received the injection. This had not been transmitted through the liver, for the portal vein at the transverse fissure was empty, but through a distinct extra-hepatic portal track, which was found lying under the peritoneum beneath the position of the hepatic pouches, and in association with the umbilical pouches. This vessel began by relatively large radicals towards Chang’s side, became larger as these encroached on Eng’s side, and was finally received within the portal system of Eng’s body, as a tributary to its mesenteric vein.
Fig. 11. The surface, C. R., E. L., with pouches removed to display the hepatic tract. A. Liver of Chang. B. Liver of Eng. C. Portal vessel of Chang. D, D. Minute branches of hepatic artery. E. Subcutaneous fat of surface, E. R., C. L.
No other vessels were met with in the band excepting a few insignificant branches of the hepatic artery, and the terminal twigs of the right internal mammary of Eng. The former vessels are marked D, D, Fig. [11]. The latter vessel terminated by piercing the diaphragm, and giving ultimate filaments to the integument of the “front” of the band as shown in Fig. [12].
Fig. 12. The surface, C. R., E. L., with pouches, hepatic tract, and peritoneal attachments removed to display the diaphragms. A. Subcutaneous fat of surface, E. R., C. L. B, C. Symmetrical muscular fasciculi. D. Fasciculi of Eng crossing the median line of the band.
4. The diaphragms.—The subject being in the same position as in Fig. [2], the livers were removed, the peritoneal coverings dissected from the band, and the diaphragms exposed (Fig. [12]). The point (A), marked by the terminal twigs of the right internal mammary of Eng, indicated the “anterior” of the band. A broad slip of fibres of Chang (B) was seen to pass across the median line, and to be inserted into the left border of the ensiform cartilage of Eng (Fig. [17]). This arrangement would appear to correspond to the smaller collection of fibres (C) belonging entirely to Eng. A second arrangement of fibres was seen above those just indicated, immediately under the cartilages (D). This appeared to arise from the border of the cordiform tendon of Eng by two distinct narrow slips, which crossed the median line to be inserted dispersedly on the diaphragm of Chang.