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Indicate the midsternal part and the vertebral part of lungs

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lungs mediastinal surface vertebral part midsternal part anatomy

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lung anatomy

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The mediastinal surface is the medial surface of each lung, facing the mediastinum. The hilum divides it into two parts:
  1. Anterior mediastinal part
    • Lies in front of the hilum.
    • Faces the heart and pericardium.
    • Shows the cardiac impression.
    • The left lung has a deeper cardiac impression because of the heart’s leftward position.
  2. Posterior vertebral part
    • Lies behind the hilum.
    • Faces the sides of the thoracic vertebral bodies.
    • It bears grooves/impressions from nearby structures:
      • Right lung: esophagus and azygos vein.
      • Left lung: descending thoracic aorta.
The term “midsternal part” is likely intended to mean the anterior mediastinal part, not a separate standard surface of the lung. The hilum separates the anterior mediastinal part from the posterior vertebral part.
Color Atlas of Human Anatomy, Vol. 2: Internal Organs, p. 211

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mediastinal surface of lung hilum anterior mediastinal part posterior vertebral part labeled anatomy illustration

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labeled mediastinal surface lung vertebral part anterior mediastinal surface image anatomy

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lung anatomy

Mediastinal surface of the lung, showing the anterior mediastinal part and posterior vertebral part
The part anterior to the hilum is the anterior mediastinal part, and the part posterior to the hilum, adjacent to the vertebral column, is the vertebral part. See the lung anatomy reference.
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