dorsal surface of sacrum

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dor·sal sur·face of sa·crum

the posterosuperior aspect of the sacrum marked by a median and two lateral sacral crests between which four dorsal sacral foramina are located on each side.
Synonym(s): facies dorsalis ossis sacri [TA]
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The Z-shaped bracket was positioned with the upper wing on the dorsal surface of the posterior superior iliac spines and the lower wing close to the dorsal surface of sacrum.

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