NEET PG DENTAL EXAM

BRAIN

MEDULLA

 Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
Diameter of the medulla is 0.2 and diameter of the hair is 0.4. What is the medullary index?
 A 2.5 B 0.5 C 0.1 D cannot be determined
Explanation:

Detailed explanation-1: -The diameter of the medulla is a useful parameter to differentiate between the human and animal hair. It is observed in the present study that the diameter of medulla of human hair was 0.1 mm and the diameter of medulla of animal hair was between 0.2 mm to 0.6 mm.

Detailed explanation-2: -Medullary Index: The ratio of the diameter of the medulla to the diameter of the entire hair is known as the medullary index. If the medullary index is 0.5 or greater, the hair most likely is animal hair. If the medullary index is 0.33 or less, the hair most likely is human hair.

Detailed explanation-3: -Usually, human hairs have a medullary width that is less than one-third of the diameter of the hair (approximately 0.3), while animal hairs have larger medulla and medullary indices greater than 0.5, indicating that the medulla is at least half as wide as the total diameter of the hair shaft.

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