Transcontinental railroads in and near the United States (1887). A transcontinental railroad is a contiguous network of railroad trackage that crosses a continental land mass with terminals at different oceans or continental borders.
Normal cervical range of motion is. 1  Flexion â 80 to 90 degrees. 2  Extension â 70 degrees. 3  Lateral flexion â 20 to 45 degrees on both sides.  Rotation â 90Â° of rotation to both sides.
Flexion extension xrays of cervical spine are Dynamic motion studies of the neck. Flexion extension xrays of cervical spineare helpful in eliciting less than obvious instability of the cervical spine and assessing the healing results of the cervical spine following trauma and other pathologies.