Sacrum and Articulated Pelvis

1How to determine sex of a sacrum with its superior surface?

2Give any 3 points to differentiate female pelvis from male pelvis

3A. Give relations of ala of sacram. B. Which structures transmit through pelvic sacral foramina?

4Give structures passing through 1. Sacral canal, 2. Sacral hiatus, 3. dorsal sacral foramina