Lumbar triangle

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Lumbar triangle
The superior and inferior lumbar triangles with a cross section at the level of the superior lumbar triangle
Image:Lumbar triangle.PNG
Posterior view of muscles connecting the upper extremity to the vertebral column. Lumbar triangle is labeled in red at bottom left.
Latin	trigonum lumbale
Gray's	subject #121 434

The lumbar triangle can refer to either the inferior lumbar (Petit) triangle, which lies superficially, and the superior lumbar (Grynfeltt) triangle, which is deep and superior to the inferior triangle. Of the two, the superior triangle is the more consistently found in cadavers,^[1] and is more commonly the site of herniation; however, the inferior lumbar triangle is often simply called the lumbar triangle, perhaps owing to its more superficial location and ease in demonstration.

Contents 1 Inferior lumbar (Petit) triangle 2 Superior lumbar (Grynfeltt) triangle 3 External links 4 References

Inferior lumbar (Petit) triangle

The inferior lumbar (Petit) triangle is formed medially by the latissimus dorsi muscle;^[1] laterally by the external abdominal oblique muscle; and inferiorly by the iliac crest. The floor of the inferior lumbar triangle is the internal abdominal oblique muscle.

Superior lumbar (Grynfeltt) triangle

The superior lumbar (Grynfeltt) triangle is formed medially by the quadratus lumborum muscle, laterally by the internal abdominal oblique muscle, and superiorly by the 12th rib. The floor of the superior lumbar triangle is the transversalis fascia and its roof is the external abdominal oblique muscle.

External links

• SUNY Labs 01:02-0104
• t_19/12823505 at Dorland's Medical Dictionary - inferior
• t_19/12823517 at Dorland's Medical Dictionary - superior

References

v • d • e General anatomy of torso
Thorax/ Thoracic cavity	Mediastinum (Superior, Anterior, Middle, Posterior) • Superior thoracic aperture • Inferior thoracic aperture • Triangle of auscultation • Intercostal space • Thoracic plane • Thoracic wall/Thoracic cage - fascia (Pectoral fascia, Clavipectoral fascia, Thoracolumbar fascia) • Chest • Midsternal line
Thoracic diaphragm	openings (Caval opening, Esophageal hiatus, Aortic hiatus, Foramina of Morgagni) • Central tendon • Crus of diaphragm • arcuate ligaments (Lateral, Medial, Median)
Abdomen/ Abdominal cavity	Retroperitoneum • Paracolic gutters • Hepatobiliary triangle anterior abdominal wall (Arcuate line, Linea alba, Tendinous intersection, Linea semilunaris, McBurney's point, Traube's space, Inguinal triangle) • Inguinal canal (Deep inguinal ring, Superficial inguinal ring, Intercrural fibers, Crura of superficial inguinal ring) • Lumbar triangle • regions (Epigastrium, Hypochondrium, Umbilical region, Latus, Hypogastrium, Inguinal region) • planes (Transpyloric plane, Intertubercular plane, Midclavicular line) fascia (Fascia of Camper, Fascia of Scarpa, Transversalis fascia, Renal fascia, Rectus sheath)
Pelvis/ Pelvic cavity	Pelvic floor • Retropubic space fascia (Pelvic fascia, Superior fascia of diaphragm of pelvis, Inferior fascia of diaphragm of pelvis, Fascia of the Obturator internus, Tendinous arch, Iliac fascia, Iliopectineal fascia)
Perineum	Anal triangle (Ischioanal fossa, Pudendal canal, Anococcygeal raphe) Urogenital triangle (Superficial perineal pouch, Deep perineal pouch) Perineal body fascia (Dartos/fascia of perineum/superficial perineal fascia/Fascia of Colles, Perineal membrane/"Inferior fascia of UGD", "Superior fascia of UGD")