. The anatomy of the domestic animals. Veterinary anatomy. 758 CIRCULATORY SYSTEM OP THE DOG The lumbar 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 lef
. The anatomy of the domestic animals. Veterinary anatomy. 758 CIRCULATORY SYSTEM OP THE DOG The lumbar 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. Iia most cases there is a gland on each sitle 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 Fig. 625.—Ltmph Glands op Abdominal Visceha of Dog. 1-6, Portal lymph glands; 7, 8, mesenteric lymph elands; 9-11, CEeco-colic lymph glands; a, liver; b, stomach; c, spleen; rf, duodenum {cut off and indicatetl by dotted line); e, jejunum; /.ileum; (/.caecum; A, i, t, right, transverse, and left parts of colon; /, portal vein; /J, gastro-duodena! vein; 7//, gastro-splenic vein; /T, splenic vein; T, common gastric vein; VJ, radicles of splenic vein; T"//, ileo-cseco-coUc vein; 1'///, left coUc vein; JA', middle colic vein; A', right cohc vein; A'l, caecal vein; A'//, ileal vein; A///, jejunal venous trunk. (After Merzdorf.) The external iliac 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 ar
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