Hemal nodes are small lymphatic bodies resembling lymph nodes in their structure, which are found in the course of blood vessels. The afferent and efferent lymphatics are absent. Their sinuses are filled with blood rather than lymph. These are found in some animals in relation to their abdominal and thoracic viscera. Hemal nodes may represent an intermediate stage between a lymph node and the spleen. In man, the spleen is a large hemal node.