When do friction ridges begin to develop?

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Multiple Choice

When do friction ridges begin to develop?

Explanation:
Friction ridges form as the skin on the fingers differentiates in the womb. Their initial appearance occurs during the 3rd and 4th months of fetal life, when the epidermis creates ridges over the underlying dermal papillae to produce the patterns that become fingerprints. By mid-gestation the ridges are largely established and remain essentially unchanged after birth, except in cases of injury. So the mid-fetal period—the 3rd and 4th months—is when these ridges begin to develop.

Friction ridges form as the skin on the fingers differentiates in the womb. Their initial appearance occurs during the 3rd and 4th months of fetal life, when the epidermis creates ridges over the underlying dermal papillae to produce the patterns that become fingerprints. By mid-gestation the ridges are largely established and remain essentially unchanged after birth, except in cases of injury. So the mid-fetal period—the 3rd and 4th months—is when these ridges begin to develop.

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