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Pulmonary trunk

Dr Henry Knipe ◉ ◈ and Dr Craig Hacking ◉ ◈ et al.

The pulmonary trunk or main pulmonary artery is the solitary arterial output from the right ventricle, transporting deoxygenated blood to the lungs for oxygenation.

Gross anatomy

The pulmonary trunk is approximately 50 mm long and 30 mm wide (most authors use 29 mm width as the cut-off of normal ¹). It arises as a direct superior continuation of the right ventricular outflow tract, separated by the pulmonary valve. As it ascends it slants posteriorly and to the left of the ascending aorta. With the ascending aorta, the pulmonary trunk is invested in a common sheath of serous visceral pericardium, anterior to the transverse pericardial sinus.

At the level of the transthoracic plane, the trunk emerges from the fibrous pericardium and divides into the longer right and shorter left pulmonary arteries in the concavity of the aortic arch, anterior to left main bronchus and to the left of the carina.

The left coronary artery passes between the pulmonary trunk of the left and the auricle of the left atrium.

Related pathology

References

Anatomy: Thoracic

thoracic skeleton
- thoracic cage
  - ribs
    - typical ribs
    - atypical ribs
    - variant anatomy
      - bifid ribs
  - 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: 49256

System: Vascular, Chest

Section: Anatomy

Tag: cases

Synonyms or Alternate Spellings:

Pulmonary artery

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Cases and figures

Figure 1Figure 1

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Figure 2Figure 2

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Figure 3: mediastinum (Gray's illustration)Figure 3: mediastinum (Gray's illustration)

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Figure 4Figure 4

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