Back and Spinal Cord - LO 3
3. Describe the borders and clinical significances of the triangle of auscultation and the inferior lumbar triangle.
3. Describe the borders and clinical significances of the triangle of auscultation and the inferior lumbar triangle.
Triangle of auscultation: The triangle of auscultation is a region of the posterior thorax devoid of superficial back muscles, which allows for optimal auscultating lung sounds. Borders include:
Laterally: Medial border of the scapula (border of rhomboid major m.),
Medially: Ascending fibers of the trapezius m., &
Inferiorly: Superior border of the latissimus dorsi m.
Inferior lumbar (Petit’s) triangle: The inferior lumbar triangle is a region of the lower back devoid of superficial back muscles, which is mildly susceptible to herniation (protrusion of tissue or organs). Inferior lumbar hernias are very uncommon. Borders include:
Laterally: External oblique m.,
Medially: Latissimus dorsi m., &
Inferiorly: Iliac crest.
