THE LYMPH NODES OF THE ABDOMINAL ROOF
A number of important lymph nodes are scattered about the bifurcation of the aorta and between its terminal branches. Most belong to the medial iliac group, which collects lymph from the hindlimbs, pelvic walls, and pelvic viscera (see Figure 29-4).
The large deep inguinal (iliofemoral) node, in the angle between the external and deep circumflex iliac arteries, receives the flow from the udder; when enlarged it can be palpated per rectum near the cranial border of the ilium. The efferent stream forms the lumbar trunk, which runs forward over the aorta to enter the cisterna chyli.A few much smaller (lumbar aortic) nodes that are spread along the psoas musculature are concerned with the lymphatic drainage of the vertebrae and neighboring muscles. The renal nodes belong to this series.
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