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In page Trichuriasis:

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Adult worms are usually 3–5 centimetres (1.2–2.0 in) long, with females being larger than males as is typical of nematodes. The thin, clear majority of the body (the anterior, whip-like end) is the esophagus, and it is the end that the worm threads into the mucosa of the colon. The widened, pinkish-gray region of the body is the posterior, and it is the end that contains the parasite's intestines and reproductive organs. T. trichiura eggs are prolate spheroids, the shape of the balls used in Rugby and Gridiron football. They are about 50–54 μm (0.0020–0.0021 in) long and have polar plugs (also known as refractile prominences) at each end.[citation needed]