Pith, or medulla, is a tissue in the stems of vascular plants. Pith is composed of soft, spongy parenchyma cells, which store and transport nutrients throughout the plant. In eudicots, pith is located in the center of the stem. In monocots, it extends also into flowering stems and roots. The pith is encircled by a ring of xylem; the xylem, in turn, is encircled by a ring of phloem.
Throughout the lymph node's interior are a series of street-like channels called sinuses that help guide the flow of lymph from the afferent lymphatic vessels, through the cortex and medulla, and finally to the efferent lymphatic vessels at the hilum.ach lymph node chain is responsible for draining a particular body region or structure. For example, the lymph node chains in your armpits drain your arms and upper chest, while the chains in your groin are responsible for filtering lymph from your feet, legs, genitals, and lower abdominal wall.
Lymph nodes are small round organs that are part of the bodyâs lymphatic system. They are found widely throughout the body and are connected to one another by lymph vessels. Groups of lymph nodes are located in the neck, underarms, chest, abdomen, and groin.A clear fluid called lymph flows through lymph vessels and lymph nodes. Anatomy of the lymphatic system, showing the lymph vessels and lymph organs, including lymph nodes, tonsils, thymus, spleen, and bone marrow.roups of lymph nodes are located in the neck, underarms, chest, abdomen, and groin. A clear fluid called lymph flows through lymph vessels and lymph nodes. Anatomy of the lymphatic system, showing the lymph vessels and lymph organs, including lymph nodes, tonsils, thymus, spleen, and bone marrow.