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Left upper lobe

Dr Phillip Marsh ◉ and Dr Jeremy Jones ◉ et al.

The left upper lobe (LUL) is one of two lobes in the left lung. It is separated from the left lower lobe by the left oblique fissure and subdivided into four bronchopulmonary segments, two of which represent the lingula.

Gross anatomy

Location and structure

The left upper lobe lies in the upper aspect of the left hemithorax and contains four bronchopulmonary segments:

Like all the pulmonary lobes, it is lined by visceral pleura which reflects at the pulmonary hilum where it is continuous with the parietal pleura. The left upper lobe bronchus arises from the superolateral wall of the left main bronchus to traverse the left hilum into the LUL.

The LUL is separated from the LLL below and posteriorly by the oblique fissure.

Arterial supply

Like all the lobes of the lung, the LUL has dual arterial supply:

deoxygenated blood from the left upper lobar pulmonary artery
oxygenated blood from branches of the left bronchial arteries

Venous drainage

Venous drainage of newly oxygenated blood is via the left superior pulmonary vein into the left atrium.

Left bronchial veins drain into the accessory hemiazygos vein or the
left superior intercostal vein.

Lymphatic drainage

The superficial subpleural lymphatic plexus drains the lung parenchyma and visceral pleura to the bronchopulmonary (hilar) lymph nodes in the hilum.

The deep bronchopulmonary lymphatic plexus (in the bronchial submucosa and peribronchial interstitium) drains the root of the lung to hilar lymph nodes in the hilum.

The hilar lymph nodes then drain to the tracheobronchial lymph nodes.

Innervation

parasympathetic fibers from the vagus nerve (CN X)
sympathetic fibers from the paravertebral sympathetic trunks

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: 13470

System: Chest

Section: Anatomy

Synonyms or Alternate Spellings:

LUL

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Cases and figures

Figure 1: left sided bronchiFigure 1: left sided bronchi

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Figure 2: Bronchopulmonary Segments: annotated CTFigure 2: Bronchopulmonary Segments: annotated CT

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Normal chest x-ray - lobes (illustration)Normal chest x-ray - lobes (illustration)

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Normal chest x-ray - lobes (illustration)Normal chest x-ray - lobes (illustration)

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Case 1: Tuberculosis - left upper lobeCase 1: Tuberculosis - left upper lobe

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Left upper lobe c...

Case 2: Left upper lobe collapseCase 2: Left upper lobe collapse

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Large left upper ...

Case 3: Large left upper lobe necrotic lung cancer - histology unknownCase 3: Large left upper lobe necrotic lung cancer - histology unknown

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