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Illustration of a human eye, showing a quarter dissection (left) and a detail of the retinal membrane (right). Shown are the cornea, iris, lens, retina, blood vessels (supplying zinc and other nutrients), macula, optic nerve, and eye muscle (quarter dissection view); and the nerve ending, rod, and cone (detail view).
Grayscale illustration of root canal therapy. To save a tooth, diseased pulp is removed and any abscess is drained (top right). Once the infection is gone, root canals are lined with cement, filled, and sealed (middle right). Tooth restoration is often completed with a crown supported by a post (bottom right). A normal tooth is also shown (left).
Grayscale illustration of three cross section views of the human eye, showing normal anatomy (left), glaucoma (top right), and cataracts (bottom right). Glaucoma is caused by a buildup of fluid that increases pressure in the eyeball, damaging the optic nerve. A cataract is caused by changes in proteins that cause the lens to become opaque.
Illustration of diabetic arterial disease and foot drop. Foot drop is associated with vascular disorders (especially in diabetics), and symptoms may result from ankle joint deterioration, foot drop, or sensory impairment. The patient often walks gingerly with a cane. because of a loss of position sense.