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  Posterior-inferior view of the adult skull

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 1. Occipital condyle

 2. Mandibular fossa

 3. Styloid process

 4. Mastoid process

 5. Foramen magnum

 6. Occipital bone

 7. Superior nuchal line

 8. External occipital protuberance

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Superior to the foramen magnum is the superior nuchal line, a rough ridge forming a semicircle between the foramen magnum and the lambdoid suture.  This line is an important attachment point for a number of neck and back muscles and marks the upper boundary of the neck.  At the middle of the superior nuchal line is a bump that you can feel on the back of your own skull called the external occipital protuberance.

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