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# Nerve Regeneration The image depicts a step-by-step process of nerve regeneration following an injury. **Stage 1: Trauma** 1. Trauma severs the axon. **Stage 2: Proximal Portion Response** 2. The proximal portion of each severed axon seals off and swells. The distal portion of the axon and...

# Nerve Regeneration The image depicts a step-by-step process of nerve regeneration following an injury. **Stage 1: Trauma** 1. Trauma severs the axon. **Stage 2: Proximal Portion Response** 2. The proximal portion of each severed axon seals off and swells. The distal portion of the axon and myelin sheath degenerates, while the neurilemma survives. **Stage 3: Regeneration Tube Formation** 3. The neurilemma and endoneurium form a regeneration tube. **Stage 4: Axon Regeneration** 4. The axon begins to regenerate, and remyelination occurs. **Stage 5: Restoration of Innervation** 5. Innervation to the effector is restored. **Key Structures/Terminology:** * **Endoneurium:** Connective tissue that surrounds individual nerve fibers. * **Neurilemma:** The outer layer of the nerve fiber. * **Axon:** The long, slender projection of a neuron that transmits electrical impulses. * **Myelin Sheath:** A fatty layer that insulates the axon, increasing the speed of signal transmission. * **Skeletal Muscle Fibers:** Muscle fibers that are stimulated by the nerve to contract. * **Effector:** The organ or cell that is stimulated by the nerve impulse. This could be a muscle fiber in this case.