HISTOLOGY
INTEGUMENTARY SYSTEM SKIN
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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The visible part of hair. It begins in the follicle and extends up through the skin.
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The beginning of the hair found in the hair follicle.
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A sac in the outer layer of skin where the hair grows.
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The inferior or lower portion of a hair in a hair follicle.
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Detailed explanation-1: -Each hair has a hair shaft and a hair root. The shaft is the visible part of the hair that sticks out of the skin. The hair root is in the skin and extends down to the deeper layers of the skin. It is surrounded by the hair follicle (a sheath of skin and connective tissue), which is also connected to a sebaceous gland.
Detailed explanation-2: -The hair bulb forms the base of the hair follicle. In the hair bulb, living cells divide and grow to build the hair shaft.
Detailed explanation-3: -The hair shaft is the part of hair we see above the skin. It can have three layers-the medulla, the cortex, and the cuticle.
Detailed explanation-4: -Subsequently, hair matrix melanocytes begin to develop pigment and the form of the hair shaft begins to arise; in anagen VI, hair bulb and adjacent the dermal papilla formation is realized and the new hair shaft appears from the skin. This phase can last up to 6–8 years in hair follicles [1, 11, 18].