758 



CIRCULATORY SYSTEM OF THE DOG 



The liombar lymph glands are situated in the sublumbar region around and 

 between the aorta and posterior vena cava. Most of them are very small and are 

 difficult to find in the fat in which they are usually embedded. Their number is 

 very variable; as many as fifteen have been counted. 



Usually two large internal iliac lymph glands are present. The right one lies 

 along the posterior part of the posterior vena cava and the common iliac vein; the 

 left one is similarly placed in relation to the aorta and left common iliac vein. They 

 may be two inches or more (ca. 5-6 cm.) in length and nearly an inch (ca. 2 cm.) 

 wide in large dogs. In some cases there is a third small gland anterior to the large 

 one in relation to the origin of the circumflex iliac vessels. In most cases there is a 

 gland on each side of the middle sacral artery, between that vessel and the internal 

 iliac artery and its visceral branch. The gland may be absent on one side or there 

 may be instead two or three glands. 



Fig. 625. — Ltaiph Glajtds of Abdomtnal Visceha of Dog. 

 1-6, Portal lymph glands; 7, 8, mesenteric lymph glands; 9-11, cseco-colic lymph glands; a, liver; h, stomach; 

 c, spleen; rf, duodenum (cut off and indicated by dotted line); c, jejunum; /.ileum; (/, ctecum; A, i, /:, right, transverse, 

 and left parts of colon; J, portal vein; /J, gastro-duodenal vein; J/J, gastro-splenic vein; /T, splenic vein; V, common 

 gastric vein; IT, radicles of splenic vein; VII, ileo-c£eco-colic vein; VIII, left colic vein; IX, middle colic vein; X, 

 right colic vein ; XJ, ceecal vein; X/J, ileal vein; A'7J/, jejunal venous trunk. (After Merzdorf.) 



The external iUac lymph glands are situated on the ventral surface of the psoas 

 minor, between the diverging external and internal iliac veins. ^ They are inconstant 

 and variable. One may occur on each side or two on one side and none on the other. 



The sacral lymph glands are situated along the roof of the pelvic cavity and 

 may easily escape notice on account of the fat in which they areem bedded. Their 

 size, number, and arrangement are very variable. In the majority of subjects 

 there are two or three glands on the anterior part of the sacro-coccygeus ventralis 

 in relation to the middle coccygeal artery. In some cases one or two glands occur 

 at the interspace between the sacro-coccygeus ventralis and the coccygeus. In 

 other cases glands are present centrally or on one side only or appear to be absent. 



The term portal lymph glands may be applied to those which occur along the 

 course of the portal vein and some of its affluents. The larger and more constant 

 of these are as follows : One lies to the left of the portal vein, on the origin of the 



' It seems not unlikely that these glands correspond regionally to the deep inguinal glands 

 of the horse. 



