ACTION: extends spine
REFERRAL: back, ilium, sacrum

COMMENTS: The erector spinae group is made up of three muscles, the spinalis most medially, the longissimus in the center, and iliocostalis laterally.

The spinalis is just next to the spine, and to work on this muscle you will need you use your fingertips or thumbs.

The longissimus is the main meat of the erector group, and is palpated as a taught rope half an inch lateral to the spine.

The main attachment of the iliocostalis is to the ilium and ribs. Because of it's lateral position, a tight iliocostalis can bring a hip up, or bring the ribcage down toward the hip.