occipital crest
nounMedical Definition of occipital crest
: either of the two ridges on the occipital bone connecting the occipital protuberances and foramen magnum:
a
: a median ridge on the outer surface of the occipital bone that with the external occipital protuberance gives attachment to the ligamentum nuchae
— called also external occipital crest, median nuchal line
b
: a median ridge similarly situated on the inner surface of the occipital bone that bifurcates near the foramen magnum to give attachment to the falx cerebelli
— called also internal occipital crest