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Actually some people are born with "monkey tails". One of the most striking is the existence of the rare "true human tail" (also variously known as "coccygeal process," "coccygeal projection," "caudal appendage," and "vestigial tail"). More than 100 cases of human tails have been reported in the medical literature. The true human tail is characterized by a complex arrangement of adipose and connective tissue, central bundles of longitudinally arranged striated muscle in the core, blood vessels, nerve fibers, nerve ganglion cells, and specialized pressure sensing nerve organs (Vater-Pacini corpuscles). It is covered by normal skin, replete with hair follicles, sweat glands, and sebaceous glands. True human tails range in length from about one inch to over 5 inches long (on a newborn baby), and they can move and contract. Although human tails usually lack skeletal structures several human tails have also been found with cartilage and up to five, well-developed, articulating vertebrae.Baruchin et al. 1983; Dao and Netsky 1984; Lundberg et al. 1962)

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10y ago

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