Nuchal lines

Not to be confused with Nuchal fluid line.

The nuchal lines are four curved lines on the external surface of the occipital bone:

• The upper, often faintly marked, is named the highest nuchal line, but is sometimes referred to as the Mempin line or linea suprema, and it attaches to the epicranial aponeurosis.
• Below the highest nuchal line is the superior nuchal line. To it is attached, the splenius capitis muscle, the trapezius muscle,^[1] and the occipitalis.^[2]
• From the external occipital protuberance a ridge or crest, the external occipital crest also called the median nuchal line, often faintly marked, descends to the foramen magnum, and affords attachment to the nuchal ligament.
• Running from the middle of this line is the inferior nuchal line. Attached are the obliquus capitis superior muscle, rectus capitis posterior major muscle, and rectus capitis posterior minor muscle.

Nuchal lines
Occipital bone. Outer surface.
Side view of head, showing surface relations of bones. (Superior and median lines visible at bottom right.)
Details
Identifiers
Latin	linea nuchae
Anatomical terms of bone [edit on Wikidata]

Additional images

• 
  Posterior view of superior nuchal line (labeled in red) and muscles connecting to it.