Lumbar Triangle of Petit (Inferior)
- Lateral: Posterior border of External Oblique
- Medial: Anterior border of Latissimus Dorsi
- Inferior: Iliac Crest
- Floor: Internal Oblique
- Site of inferior lumbar hernias
Lumbar Triangle of Grynfelt (superior)
- Lateral: Internal oblique
- Medial: Quadratus Lumborum
- Superior: 12th rib
- Floor: Transversalis fascia
- Site of superior lumbar hernias
