Intercostal Spaces of the Thorax Anatomy, Contents, and Clinical Significance
Introduction Intercostal spaces are the spaces between adjacent ribs. They contain muscles, nerves, and blood vessels essential for respiration and thoracic wall function.
Anatomy of Intercostal Spaces There are 11 intercostal spaces between the 12 pairs of ribs. Each space is bordered by the external, internal, and innermost intercostal muscles.
Contents of Intercostal Spaces - **Muscles**: External, internal, and innermost intercostals - **Nerves**: Intercostal nerves from the ventral rami of thoracic spinal nerves - **Vessels**: Intercostal arteries and veins
Clinical Significance - **Intercostal neuralgia**: Pain due to nerve irritation - **Thoracostomy (Chest Tube Insertion)**: Performed in the 4th or 5th intercostal space - **Rib Fractures**: Can damage intercostal vessels and nerves