one of several charts used in testing visual acuity. Letters, numbers, or symbols are arranged on the chart in decreasing size from top to bottom. A wall chart developed by a Dutch ophthalmologist Hermann Snellen in the 19th century, which is still used today to measure visual acuity.
Popliteal Nodes. The popliteal nodes, or popliteal lymph nodes, include six or seven nodes and are located in the legs near the knees at the popliteal fossa.They service the lower legs and feet for the lymphatic system.opliteal Nodes. The popliteal nodes, or popliteal lymph nodes, include six or seven nodes and are located in the legs near the knees at the popliteal fossa.
Lymph nodes are small organs of the lymphatic immune system located around the body and linked by their own lymphatic blood supply. The hilum of the lungs is also known as the pedicle and contains pulmonary arteries and veins, main bronchial stems for each lung and the hilum of lymph node for each lung.ost 1. Blood vessels, nerves and the bronchus enter the lungs at the hilum, which is a concave portion on the mediastinal side of the lungs (space between the lungs that houses the heart) A hilum is present in each lung.