Normal cervical spine extension is up to how many degrees?

Normal cervical spine extension is up to how many degrees?

• A. 0-70°
• B. 0-50°
• C. 0-90°
• D. 0-20°

Answer: (A)

Understanding how far the neck can extend from a neutral position is the key idea here. Normal cervical spine extension is the backwards tilt of the head from neutral, and in a healthy adult this reaches about 70 degrees. The joints at the base of the skull (occipito-atlantal region) and the surrounding soft tissues limit this motion, so 0 to roughly 70 degrees is the typical upper limit you’d expect in everyday movement. Choosing a value like 0-50 would underestimate the reachable range, while 0-90 would exceed what’s usually considered normal for most people. A very small range like 0-20 is also not representative of normal motion. Therefore, 0-70 degrees best fits the standard normal extension range.

Understanding how far the neck can extend from a neutral position is the key idea here. Normal cervical spine extension is the backwards tilt of the head from neutral, and in a healthy adult this reaches about 70 degrees. The joints at the base of the skull (occipito-atlantal region) and the surrounding soft tissues limit this motion, so 0 to roughly 70 degrees is the typical upper limit you’d expect in everyday movement.

Choosing a value like 0-50 would underestimate the reachable range, while 0-90 would exceed what’s usually considered normal for most people. A very small range like 0-20 is also not representative of normal motion. Therefore, 0-70 degrees best fits the standard normal extension range.