SUMMARY SO FAR Regenerative Nonregenerative tissues tissues, rever- Reversible injury. sible injury No contraction. Contraction scar SKIN epidermis dermis BM NERVE myelin endoneurial stroma BMSUMMARY SO FAR Regenerative tissues. Reversible injury. No contraction. Nonregenerative tissues. Irrever￾sible injury. Contraction +scar. SKIN epidermis dermis BM NERVE myelin endoneurial stroma BM