C4 Spinal Cord Injury Guidelines

Anatomical Organization

The C4 spinal cord level contains neural pathways that control diaphragmatic breathing, upper extremity function, and serves as a critical transition zone between cervical and upper thoracic innervation patterns, as noted by the American College of Radiology 1, 2
The lateral corticospinal tracts at C4 carry descending motor signals to all four extremities, while the dorsal columns transmit ascending sensory information including proprioception and fine touch, according to the Journal of Neurosurgery 3
The C4 nerve root emerges at this level and contributes to the brachial plexus formation, as reported by the American College of Radiology 1, 2

Injury at C4 typically results in complete tetraplegia with loss of hand function, bilateral weakness affecting biceps, triceps, wrist extensors, and finger flexors, as stated by the World of Neurosurgery 4
Cord edema or compression at C4/C5 typically manifests with sensory changes below the level of injury, often with patchy distribution or a defined sensory level, according to the World of Neurosurgery 4
Incomplete C4 injury may present with bilateral hand weakness, gait disturbance, hyperreflexia, and variable sensory changes, with potential for recovery following the central cord syndrome pattern, as noted by the World of Neurosurgery 4

Cord edema at C4/C5 should correlate with clinical myelopathy including bilateral hand dysfunction, not isolated findings like single finger drop, as stated by the World of Neurosurgery 4
T2-weighted imaging showing cord signal changes from C4-C6 indicates significant cord injury and predicts bilateral upper extremity involvement with potential lower extremity signs, according to the World of Neurosurgery 4
Comprehensive examination must include all upper extremity myotomes systematically, reflexes, gait assessment, and sensory level determination to accurately localize pathology to the C4 level, as reported by the World of Neurosurgery 4