Which vertebral level is commonly used as the hairline landmark on the back of the neck?

Which vertebral level is commonly used as the hairline landmark on the back of the neck?

• A. C1
• B. C2
• C. C3
• D. C4

Answer: (B)

The hairline landmark on the back of the neck corresponds to the second cervical vertebra, the axis. Its spinous process is the first prominent bump you can reliably feel just below the base of the skull, making it a practical starting reference for locating the upper cervical spine. The atlas (the first cervical vertebra) doesn't present a easily palpable spinous process in this area, so the hairline point is anchored at C2, with the next levels (C3, C4, etc.) located progressively lower from there.

The hairline landmark on the back of the neck corresponds to the second cervical vertebra, the axis. Its spinous process is the first prominent bump you can reliably feel just below the base of the skull, making it a practical starting reference for locating the upper cervical spine. The atlas (the first cervical vertebra) doesn't present a easily palpable spinous process in this area, so the hairline point is anchored at C2, with the next levels (C3, C4, etc.) located progressively lower from there.