Occipital bone. Outer surface.
Side view of head, showing surface relations of bones. (Superior and median lines visible at bottom right.)
|Anatomical terms of bone|
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, and to it the epicranial aponeurosis.
- Below the highest nuchal line is the superior nuchal line. To it is attached , the splenius capitis muscle, the trapezius muscle,the occipitalis and the sternocleidomastoid muscle.
- From the external occipital protuberance a ridge or crest, 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.
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