Anatom3DIliocostalis lumborum
Musculus iliocostalis lumborum · Kyčelně-žeberní sval beder
Muscles
Looks like
The lower part of the outermost back muscle column, from the back of the pelvis and sacrum up to the lower ribs.
What it does
Straightens the lower back and bends it to the side; controls bending forward.
Keeping it well
Common in low back strain; staying active beats rest. Back pain with leg weakness, bladder trouble or numbness in the saddle area is an emergency.