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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