Anatom3DPosterior layer of thoracolumbar fascia
Lamina posterior fasciae thoracolumbalis · Zadní list hrudně-bederní povázky
Fascia & connective tissue
Looks like
The thick diamond-shaped outer sheet covering the back muscles of the lower back, from the spines to the pelvis.
What it does
Links the latissimus dorsi, the glutes and belly muscles, sharing load across the lower back.
Keeping it well
Can be a source of back pain; movement and strengthening help. Pain with fever or leg weakness needs a doctor.