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lymphatic pathways bein as__that merge to form lymphatic vessels lymphatic capillaries The wall of a lymphatic capillary consists of a single layer of what? squamous epithelium Once tissue intersititual fluid is inside a lymph capillary, the fluid is called lymph Lymphatic vesels have walls similar to those of what? veins Lymphatic vessels contain something that help prevent the backflow of lymph, what is it? valves lymphatic vessels usually lead to what? that filer the fluid being transported lymph nodes the lymphatic trunk drains the head and neck is called the jugular trunk what is the larger and longer of the two lymphatic collecting ducts? the thoracic trunk and the left lymphatic duct Lymph nodes contain large numbers of white blood cells called lymphocytes The indented region where blood vessels and nerves join a lymph node is called the hilum the spaces within a lymoh node are called___through which lymph circulates lymph sinuses lymph enters a node through what? an afferent lymphatic vessel. the partially encapsulatd lymph node in the pharynx is called tonsil the aggregations of lymph nodules found within the mucosal lining o the small intestine are called peyers patches the lymph nodes in the cervical region are associated with the lymphatic vessels that drain what? scalp face nasal pharynx the lymph nodes associated with the lymphatic vessels which draink the lower limbs are located in what region? inguinal region the thymus is located in where? mediastinum the thymus reaches its greatest size during infancy and early childhood and tends to decrease in size following puberty as a person ages, the thymus tissue is often replaced by adipose and other connective tissues the lymphocytes of the thymus develop from precursor cells that originated in the bone marrow the hormones secreted by the thymus are called thymosins what is the largest organs of the lymphatic system spleen blood vessels enter the spleen through the region called the hium the sinuses within the spleen contain what? blood the tiny islands of t issue within the spleen that contain many lymphocytes comprise which kind of pulp white pulp which pulp of the spleen contains large numbers of red blood cells, lymphocytes, and macrophages red pulp what within the spleen engulfs and destroys foreign particles and cellular debris macrophages