THE LYMPHATIC STRUCTURES OF THE PELVIS

The medial iliac lymph nodes grouped about the termi­nal branches of the aorta have been described on page 770 and in Figure 34-12. They are continued into the pelvic cavity by sacral nodes below the sacrum and anorectal nodes below the tailhead. The latter nodes drain the rectum, anus, and tail; their efferents pass to the medial iliac nodes. Ischial nodes receiving lymph from the perineum, caudal thigh, and popliteal nodes and gluteal nodes draining the gluteal region lie lateral to the sacrosciatic ligament. Both sets also drain to the medial iliac nodes.