Fig. 1.

Diagram of different mid-thoracic penetrating SCI lesions. Coronal and sagittal views of the injury site after dorsal hemisection (A), complete transection (B) and a dorsal column lesion (C). After tracers (red) are injected into the cortex (for dorsal hemisection and complete transection) or into the peripheral nerve (for dorsal column lesion), the traced axons typically fail to regenerate across the lesion and are absent from the other side of the spinal cord. Green denotes spared axons that are not labeled by the tracer and intentionally left intact.