The medullary index of a human hair is
Human hair Animal hair Fine thin Coarse & thick Cuticular scales are sho, not continuous Cuticular scales are large, step like projections Coex thick (4-10 times as broad as medulla) Coex thin Pigment more towards the periphery Pigment more towards the medulla Medulla thin & fragmented, sometimes absent Medulla broad, continuous & always present. Medullary index <0.3 Medullary index > 0.5 Precipitin test specific for human Precipitin test specific for animal
0.2
0.4
0.5
0.6
Human identification