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This Concept Map, created with IHMC CmapTools, has information related to: Hair, the cortex contains air sacs(cortical fusi), Hair can be round(straight), 3 stages which include catagen, the cortex made of keratin, the inner layer (medulla) have a medullary index, the outer layer(cuticle) points to the tip, Hair has 3 stages, types that include absent, 3 layers which include the cortex, types that include stacked, types that include continuous, types that include intermittent or interrupted, medullary index which is 1/2, 3 layers which include the outer layer(cuticle), medullary index which is 1/3, the outer layer(cuticle) made of scales, the inner layer (medulla) has different types, scales that are either imbricate, types that include fragmented, 1/2 for animals