d. Lymphatics. The lymphatic system consists of lymph, lymphatic vessels,
and lymph nodes (see figure 1-11). Structures and glands characterized by the
presence of lymphocytic cells--spleen, tonsils, thymus, and lymphatic nodules of the
intestine (Peyer's patches)--are also part of the lymphatic system. Lymph drains
through its own system of lymphatic vessels (lymphatics) into the jugulo-subclavian
venous region of the neck and thus back to the heart. Along the course of the
lymphatics are structures called lymph nodes. Lymph nodes are filters removing
infectious materials from the lymph stream. They are also the main source of certain
white blood cells. Examples of lymph nodes are the axillary nodes and the submaxillary
nodes.
Figure 1-11. Lymphatic system.
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