The upper extremity has superficial and deep lymphatic vessels, which are directed to the ulnar and axillary lymph nodes. Surface lymphatic vessels are located near the subcutaneous veins of the upper limb and form three groups: lateral, medial and anterior.
From the organs of the head lymph vessels deliver lymph to the lymph nodes, which lie in the form of small groups on the border of the head and neck [occipital, mastoid (ear), parotid, occlusal, facial, submandibular, chin].
In the chest cavity, parietal (parietal) lymph nodes located on the respective walls (anterior, posterior and posterior) and visceral (internal) located in the thoracic cavity on the lymph flow path from its internal organs are isolated.
In the abdominal cavity, visceral (internal) and parietal (parietal) lymph nodes are also isolated. Visceral lymph nodes (nodi lymphatici viscerales) are located near the unpaired visceral branches of the abdominal aorta and their branching (near the celiac trunk, the hepatic, splenic and gastric arteries, the superior and inferior mesenteric arteries and their branches).
In the pelvic cavity and on its walls there are lymph nodes, into which the lymph vessels flow from the nearby organs, as well as the lymph vessels of the lower extremities.
On the lower extremity, the surface lymphatic vessels located above the superficial fascia are distinguished, and deep ones located near the deeply lying blood vessels (arteries and veins), as well as popliteal and inguinal lymph nodes.
The lymph from each part of the body, passing through the lymph nodes, collects into the lymphatic ducts (ductus lymphatici) and lymphatic trunks (trunci lymphatici). Six such large lymphatic ducts and trunks are isolated in the human body.
Lymphatic vessels (vasa lymphatica) are formed by the fusion of lymphatic capillaries. The walls of the lymph vessels are thicker than the walls of the lymphocapillaries.
