| 1. | The posterior lymph sacs join the cisterna chyli and lose their connections with adjacent veins.
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| 2. | Capillary plexuses and lymphatic vessels spread from the retroperitoneal lymph sac to the abdominal viscera and diaphragm.
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| 3. | The last of the lymph sacs, the paired posterior lymph sacs, develop from the iliac veins.
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| 4. | The last of the lymph sacs, the paired posterior lymph sacs, develop from the iliac veins.
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| 5. | From the jugular lymph sacs, lymphatic capillary plexuses spread to the thorax, upper limbs, neck and head.
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| 6. | The next lymph sac to appear is the unpaired retroperitoneal lymph sac at the root of the mesentery of the intestine.
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| 7. | The next lymph sac to appear is the unpaired retroperitoneal lymph sac at the root of the mesentery of the intestine.
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| 8. | The posterior lymph sacs produce capillary plexuses and lymphatic vessels of the abdominal wall, pelvic region, and lower limbs.
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| 9. | Because "'lymph sacs "'form from the venous system, they typically contain red blood cells.
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| 10. | The first lymph sacs to appear are the paired jugular lymph sacs at the junction of the internal jugular and subclavian veins.
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