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The medullary index measures the diameter of the medulla relative to the diameter of the hair shaft.

MI=

Medulla Diameter

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Hair Diameter

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Which medullary index indicates an animal hair?

The medullary index is a measurement used to differentiate between types of hair. In animal hair, the medullary index is typically greater than 0.5, indicating a wider medulla relative to the diameter of the hair shaft. In contrast, human hair usually has a medullary index of less than 0.33. Therefore, a medullary index greater than 0.5 suggests the hair is from an animal.


What medullary index is commonly considered to indicate a human hair?

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What is the medullary index of a human hair?

The medullary index of human hair is typically less than 0.33, which means that the diameter of the medulla is less than one-third of the diameter of the entire hair shaft. Human hair generally has a solid or absent medulla, making it distinct from the hairs of many other animals that may have a more pronounced medullary structure. This characteristic is often used in forensic science for hair identification and comparison.


What type of scale pattern is found in dog hair?

Dog hair typically exhibits a medullary index scale pattern, which means that the scales are small and spaced close together along the shaft. This scale pattern helps to protect the hair shaft and provides insulation for the dog's fur.


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