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nuchal line

n :  any of several ridges on the outside of the skull: as  a  :  one on each side that extends laterally in a curve from the external occipital protuberance to the mastoid process of the temporal bone - called also superior nuchal line   b  :  OCCIPITAL CREST a  c  :  one on each side that extends laterally from the middle of the external occipital crest below and roughly parallel to the superior nuchal line - called also inferior nuchal line  .
 
 

 
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