Effect of ventral combined with dorsal root avulsion on the survival rate of motoneurons in the C7 segment spinal cord. Representative micrographs of ipsilateral C7 spinal cross-sections showing the survival of motoneurons in the ventral horn on the 3rd day post-injury (A-B) and on the 14th day post-injury (C-D). Cross-sections of the spinal cord showing the lateral ventral horn region. Neurons with a large soma and typical Nissl bodies within the dotted line region were counted as surviving motoneurons. The numbers of motoneurons in the contralateral side (A, C) and the lesion (B, D) sides were counted under a 20x objective lens. Scale bar = 100 μm.