Developmental Aspect of the Integumentary System Timeline

By ClaudiaEstrada

  • 4 weeks

    Simple ectoderm epithelium over mesenchyme.

  • 1-3 moths

    Germinative cell repeated division of generates stratified epithelium. Differentiates into connective tissue and blood vessels

  • 4 months

    proliferation generates folds in basement membrane, melanoblasts migrate into epithelium, and ectoderm contributes to nails, hair follictles and glands.

  • 5 months

    Hair growth initiated at base of cord, lateral outgrowths form associated sebaceous glands.