GENERAL HISTOLOGY

INTEGUMENTERY SYSTEM

INTEGUMENTERY SYSTEM MISCELLENOUS

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
Fingerprints are determined by ridges called:
A
keratin
B
melanin
C
dermal papillae
D
lunula
Explanation: 

Detailed explanation-1: -Each ridge of the epidermis (outer skin) is dotted with sweat pores for its entire length and is anchored to the dermis (inner skin) by a double row of peglike protrusions called papillae. It is the papillae which makes our unique print.

Detailed explanation-2: -The papillae give the dermis a bumpy surface that interlocks with the epidermis above it, strengthening the connection between the two layers of skin. On the palms and soles, the papillae create epidermal ridges. Epidermal ridges on the fingers are commonly called fingerprints (see Figure 10.4.

Detailed explanation-3: -Like many other complex traits, studies suggest that both genetic and environmental factors play a role. A person’s fingerprints are based on the patterns of skin ridges (called dermatoglyphs) on the pads of the fingers. These ridges are also present on the toes, the palms of the hands, and the soles of the feet.

Detailed explanation-4: -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.

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