HISTOLOGY
INTEGUMENTARY SYSTEM SKIN
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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reticular layer
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papillary layer
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hypodermis
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None of the above
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Detailed explanation-1: -The top layer of the skin is the epidermis, which has protrusions on the surface called papillary ridges (fingerprint). These ridges overlay epidermal protrusions into the dermis (inner layer of skin) called intermediate ridges.
Detailed explanation-2: -The dermis is composed of papillary and reticular layers of fibroblasts that synthesize a variety of ECM proteins (Ham and Cormack, 1979). The papillary layer lies subjacent to the basal layer of the epidermis and derives its name from the fact that it is thrown into papillae (ridges) that project into the epidermis.
Detailed explanation-3: -Friction ridges or papillary ridges-Elevated strips of skin that begin as raised apertures around the pores and then are joined together into rows forming the ridges. Friction ridges begin to form on the human fetus during the third and fourth months of fetal life.