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 lymph nodes of the groin, or inguinal lymph nodes, are located in the crease between the leg and pelvis. There are two types of inguinal lymph nodes â superficial and deep. They often swell due to an infection or cancer in the areas from which they drain lymph (lymphatic fluid).ymph nodes are located throughout the body with each group being responsible for draining a particular area. The common lymph nodes that swell are found in the neck (cervical), armpit (axillary), and groin (inguinal), as well as in numerous other areas of the body.