Near the middle of the occipital squama is the external occipital protuberance, and extending lateralward from it on either side is the superior nuchal line, and above this the faintly marked highest nuchal line.

It is less pronounced in females.

The inion

Inion

The inion is the most prominent projection of the occipital bone at the posterioinferior part of the skull. The ligamentum nuchae and trapezius muscle attach to it....

is the highest point of the external occipital protuberance.

A projection on the external surface of the squamous part of the occipital bone in the midline

External links

• http://www.upstate.edu/cdb/grossanat/hnsklatob1.shtml