Erector Spinae Muscles Mnemonic
The three columns of erector spinae muscles from lateral to medial: Iliocostalis, Longissimus, Spinalis. These muscles run along the spine and are primary extensors of the vertebral column.
The Mnemonic
"I Love Standing (or I Like Sex)"
Breakdown
Iliocostalis
Lateral column - attaches to ribs (costalis), extends and laterally flexes spine
Longissimus
Middle column - longest muscle, runs full length of spine
Spinalis
Medial column - attaches to spinous processes, smallest column
Clinical Relevance
Erector spinae strain is a common cause of low back pain. Weakness contributes to poor posture. These muscles are targeted in rehabilitation for spinal conditions.
Study Tips
- ✓Lateral to medial: I-L-S
- ✓Think of "I" for ilium (lateral hip bone) - iliocostalis is lateral
- ✓Each column has three parts: cervicis, thoracis, lumborum
- ✓All three columns are innervated by posterior rami of spinal nerves
FAQs
Common questions about this mnemonic
The erector spinae extends the vertebral column (straightens the spine), maintains upright posture, and controls forward flexion eccentrically (slowly lowering the trunk). Unilateral contraction causes lateral flexion.
Erector spinae strain causes paravertebral muscle pain and spasm, often from lifting injuries. Pain worsens with extension and improves with flexion. Tenderness is present along the paraspinal muscles.