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Scientists in the UK recently reported that a bone that was thought to be lost to evolution is making a comeback. The little bone, known as the fabella (little bean), is found at the back of the knee – if it is found at all. The scientists discovered that pExtra nipples, bones and teeth: why?
Scientists in the UK recently reported that a bone that was thought to be lost to evolution is making a comeback. The little bone, known as the fabella (little bean), is found at the back of the knee – if it is found at all. The scientists discovered that people were nearly three-and-a-half times more likely to have the bone in 2000 than in 1900. Its exact purpose, however, remains a mystery. The fabella is not the only variation in human anatomy. Variants occur as a result of genetics, environmental factors, mistimings in embryological development, or simply a failure of structures to disappear as part of normal development. Most variations are benign and don’t cause disease. Here are some of those that are well known to us anatomists… Teeth X-ray of person with supernumerary teeth. Albert/Wikimedia Commons People have 20 primary teeth (milk teeth), which are lost and replaced by 32 permanent teeth. But up to 2% of people have extra teeth. Most of these people have one or two extra (supernumerary) teeth, but there are medical reports of people with many more extra teeth, with one female having 19 supernumerary teeth. Nipples Males and females have nipples because, early on in... Read more
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