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.
The epitrochlear lymph nodes, also known as the cubital or supraepitrochlear lymph nodes, are part of the superficial lymphatic system of the upper limb. There are usually one or two of these lymph nodes, sometimes three, and rarely four.The epitrochlear nodes are located in the subcutaneous connective tissue on the medial aspect of the elbow, about 4â5 cm above the humeral epitrochlea.evertheless, drainage areas of the upper limb are characterized by wide interindividual variability. Some lymphatic vessels arise from the epitrochlear nodes and extend to the axillary station [1] (Fig. 1). Fig. 1. Normal epitrochlear lymph node.