Lymph vessels drain lymph from all the lymphoid organs (simply because lymph vessels drain almost all organs of the body). However, lymph vessels enter (empty into) only one type of lymphoid organ. The only organ with such afferent lymph vessels is

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Lymph vessels enter only lymph nodes through afferent vessels. This is because lymph nodes are the primary site for filtering lymph and removing pathogens, making it necessary for lymph to pass through them before entering the bloodstream. The spleen, appendix, and thymus do not have afferent vessels.

Lymph Vessels Drain Lymph from All the Lymphoid Organs (Simply