Question
Triangular cross-section is seen in which type of hair ?
| A. |
Axillary hair
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| B. |
Beard hair
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| C. |
Eye brow hair
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| D. |
Scalp hair
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Show Answer
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Correct Answer � B
Explanation
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Ans.B. Beard hair
Head hair is generally circular or elliptical in cross section. Eyebrows and eyelashes are also circular but often have tapering ends. Beard hairs tend to be thick and triangular.
Beard hair – Facial hair, very coarse; 50-300 mm long; large root irregular structure; often triangular cross section; complex medullation; blunted or razor-cut tip; grows 0.40 mm/day.
Eyebrow – Superciliary; 1 cm long; 0.16 mm/day growth; curved; relatively coarse for length; smooth curve with punctuate tip and large medulla.
Scalp – Head hair; 100-1000 mm long, 25-125 μm diameter; 0.4 mm/day growth; small root; tapered tip, little diameter variation; various medullation; often with cut tips; may be artificially treated.
Axillary – arm pit; 10-50 mm long; grows 0.30 mm/day; coarse, blunt tip, abraded or frayed; usually straighter than pubic hair; many cortical fusi; sometimes yellowed and bleached.
