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Medullary Index Formula:
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The Medullary Index is a measurement used in hair analysis that represents the ratio of the medulla diameter to the overall hair diameter. It's particularly important in forensic science and veterinary medicine for identifying species based on hair characteristics.
The calculator uses the Medullary Index formula:
Where:
Explanation: The medullary index helps distinguish between different animal species as the ratio varies significantly across species.
Details: In dogs, the medullary index typically ranges between 0.5 and 0.9, which is higher than in humans (usually less than 0.3). This measurement is valuable for veterinarians, forensic experts, and researchers studying canine biology and identification.
Tips: Enter both medulla diameter and hair diameter in micrometers (μm). Ensure measurements are taken accurately using a microscope with a calibrated ocular micrometer. Both values must be greater than zero.
Q1: What is a typical medullary index for dog hair?
A: Dog hair typically has a medullary index between 0.5 and 0.9, which is significantly higher than human hair (usually less than 0.3).
Q2: Why is medullary index important in forensic science?
A: Medullary index helps distinguish between human and animal hair, which is crucial in crime scene investigations where hair evidence is found.
Q3: How should hair measurements be taken?
A: Measurements should be taken using a calibrated microscope with an ocular micrometer, preferably at the widest point of both the medulla and the entire hair shaft.
Q4: Does medullary index vary within the same dog?
A: Yes, medullary index can vary between different hair types on the same animal (guard hairs vs. undercoat) and along the length of a single hair.
Q5: Can medullary index alone identify specific dog breeds?
A: While medullary index can help distinguish between species, it's not typically specific enough to identify individual dog breeds without additional analysis.