Muscle
Erector spinae
Iliocostalis, longissimus, spinalis
High-yield
Three columns lateral→medial: "I Love Spaghetti" (Iliocostalis, Longissimus, Spinalis). Supplied by dorsal rami.
Overview
The large intrinsic back muscle group (iliocostalis, longissimus, spinalis) that extends and laterally bends the vertebral column and controls forward flexion.
Reference facts
- Origin
Broad tendon from the sacrum, iliac crest, and lumbar/sacral spinous processes
- Insertion
Ribs, and transverse and spinous processes of vertebrae up to the skull
- Action
Bilaterally extends the vertebral column and head; unilaterally laterally flexes the trunk
- Innervation
Dorsal rami of spinal nerves (segmental)
- Blood supply
Posterior intercostal, subcostal, and lumbar arteries