Lesson 4

Structure, Development & Persistence of FRS

Weeks 8-18

Crease Formation

• Major & minor creases form

  • Most develop concurrently with the volar pads but some develop independently

• Part of the same skin structure as our ridges

8 weeks - Radial Longitudinal

9 weeks - Distal Interphalangeal & Metacarpophalangeal

10 / 18 weeks - Proximal Interphalangeal

11 weeks - Distal Transverse

11.5 weeks - 1st hand movement

13 weeks - Proximal Transverse

Creases vs. White Lines

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