Tubercle
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In anatomy, a tubercle is any round nodule, small eminence, or warty outgrowth found on external or internal organs of a plant or an animal.
This view of the cactus Mammillaria marksiana shows its pattern of prominent tubercles, with the spines emanating from each tubercle's tip.
Nudibranch Phyllidia varicosa, clearly showing the yellow tubercles on the dorsum
Skin impression from the abdomen of the duck-billed dinosaur Edmontosaurus annectens, showing tubercular scales
Darwin's tubercle
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Darwin's tubercle is a congenital ear condition which often presents as a thickening on the helix at the junction of the upper and middle thirds.
Tubercle
…swellings of tissue, called the hillocks of His, arise around the area that will form the ear canal. These eventually coalesce to form the outer ear. Darwin's tubercle is a minor malformation of the junction of the fourth and fifth hillocks of His. It is found in a substantial minority of people and takes the form of…
Left: Darwin's tubercle. Right: the homologous point in a macaque.
Darwin's tubercle (helix)