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Intercostal spaces

Dr Craig Hacking ◉ ◈ and Dr Sarah Smith et al.

The intercostal spaces are the space between the ribs. There are 11 spaces on each side and they are numbered according to the rib which is the superior border of the space.

On this page:

Article:

Gross anatomy
Blood supply
Innervation
Related pathology
Related articles
References

Images:

Cases and figures

Gross anatomy

The intercostal spaces contain three layers of muscle: the external, internal and innermost layers with the neurovascular bundle found between the internal and innermost layers.

Muscle layers

The external intercostal muscle is the outermost muscle of the intercostal space. This muscle has fibers which run in a downwards, forwards and medial direction from the inferior border of the superior rib to insert on the outer lip of the inferior rib.

The internal intercostal muscle is the middle layer of the intercostal space. This muscle has fibers which run in a downwards, backwards and lateral direction from the inferior border of the superior rib to insert on the superior border of the inferior rib.

The deepest layer of muscle in the intercostal space is made up of three muscles which are collectively known as the tranversus thoracis group. This group includes the subcostal muscles posteriorly, the innermost intercostals laterally, and the transversus thoracis / sternocostalis muscles anteriorly.

Neurovascular bundle

The neuromuscular bundles are found between the middle and innermost layers, protected by the costal groove of the superior rib of each intercostal space. They are ordered vein, artery, nerve from superior to inferior (mnemonic VAN). The collateral neurovascular bundle runs at the lower edge of the space, just above the inferior rib and the order is reversed, i.e. nerve, artery, vein from superior to inferior.

Blood supply

Arterial supply

The structures in each intercostal space are supplied by a single large posterior intercostal artery and 2 smaller anterior intercostal arteries.

In the first and second intercostal spaces a large posterior artery arises from the superior intercostal artery (a branch from the costocervical artery). The superior thoracic artery (from the axillary artery) often contributes also.

The arteries in the remaining spaces branch directly from the descending thoracic aorta.

The two smaller anterior arteries in the first 6 spaces arise from the internal thoracic artery and in the remaining spaces from the musculophrenic artery.

Venous drainage

Posterior veins drain into the azygos or hemiazygos veins. Anterior veins drain into the internal thoracic or musculophrenic veins.

Innervation

Each intercostal space is supplied segmentally by muscular branches of anterior rami of spinal nerves T1-T11. The branches of anterior rami of spinal nerves are:

rami communicantes
lateral cutaneous branch
muscular branches
parietal pleura branches
parietal peritoneal sensory branches (from T7-T11 only)
collateral branch
terminal anterior cutaneous branch

Related pathology

The intercostal space is traversed during procedures such as pleural taps, and knowledge of the neurovascular bundle location is important to reduce the risk of hemorrhage.

A safe technique for insertion of intercostal catheters describes anatomical landmarks involving the axilla and a 'triangle of safety'.

References

Anatomy: Thoracic

thoracic skeleton
- thoracic cage
  - ribs
    - typical ribs
    - atypical ribs
    - variant anatomy
      - bifid ribs
      - Srb anomaly
  - costal cartilage
  - sternum
- thoracic spine
- articulations
muscles of the thorax
spaces of the thorax
thoracic viscera
blood supply of the thorax
- arteries
  - thoracic aorta (development)
  - pulmonary trunk
    - left pulmonary artery
      - aberrant left pulmonary artery
    - right pulmonary artery
- veins
  - superior vena cava (cavoatrial junction)
  - inferior vena cava
  - coronary veins
    - cardiac veins which drain into the coronary sinus
      - great cardiac vein
      - middle cardiac vein
      - small cardiac vein
      - posterior vein of the left ventricle
      - vein of Marshall (oblique vein of the left atrium)
    - anterior cardiac veins
    - venae cordis minimae (smallest cardiac veins or thebesian veins)
  - pulmonary veins
    - bronchial veins
lymphatics
innervation of the thorax

Article information

rID: 37903

System: Chest

Section: Anatomy

Tag: anatomy

Synonyms or Alternate Spellings:

Inter-costal spaces

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Cases and figures

Figure 1: intercostal spaceFigure 1: intercostal space

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