sacrum

Structure

• fusion of the 5 sacral vertebrae into one bone, the sacrum, forms the posterior wall of the pelvis
• foramina bilaterally allow passage of the 5 sacral spinal nerves S1-S5.

Articulation

• the sacrum articulates with the 5th lumbar vertebra superiorly & the coccyx inferiorly

More general terms

• bone

Additional terms

• sacroiliac joint

Component of

• bony pelvis

Components

• wing or ala of sacrum