436 DIGESTIVE SYSTEM OF THE HORSE 
The right border (Margo dexter) is thin and long; it extends backward usually 
to the sixteenth rib, a little below its middle.! 
The left border (Margo sinister) is thin and convex. It begins at the left side 
of the cesophageal notch, about a handbreadth ventral to the fourteenth thoracic 
vertebra. It curves downward, outward, and somewhat forward to a point opposite 
Renal impression Caudate process 
—. 
a 
ne 1 
Posterior vena cava 
Attachment of yastro-pancreatic fold ~ f 
Portal vein Ts 
Portal fissure __ - 
Hepatic artery = 
Attachment of lesser omentum _ 
Hepatic duct _~ 
(Esophageal notch 
Left lateral 
ligament 
] Interlobar fissure 
if 
Umbilical fissure 
Fic. 373.—Liver or Horse; VISCERAL SURFACE. 
Specimen from middle-aged subject, hardened in situ. The fissure between the left and middle lobes is shown but 
not marked. 
the ventral end of the ninth rib, and then runs forward about parallel with the 
costal arch as far as the ventral end of the seventh rib. The ventral and lateral 
borders together constitute the margo acutus. 
The liver is held in position largely by the pressure of the other viscera and 
by its close application and attachment to the diaphragm. It has six ligaments. 
1 The right border varies much in subjects in the dissecting room, since in old subjects the’ 
right lobe is often greatly atrophied. Atrophy of the left lobe is extremely rare. 
