opisthion /opis·thi·on/ (o-pis´the-on) the midpoint of the lower border of the foramen magnum.
opisthion
opisthion (ōpis´thēôn),
o·pis·thi·on ( -p s th - n )n. The middle point on the rear margin of the great foramen. |
opisthion
[ō·pis′thē·on]
Etymology: Gk, opisthion, rear, posterior
a landmark located at the midpoint of the posterior border of the foramen magnum.
opisthion (ōpis´thēôn),
n the hindmost point on the posterior margin of the foramen magnum.
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