Normal Anatomy

The pulmonary artery conveys venous blood from the right ventricle to the lungs. It is a short, wide vessel, about 5 cm in length and 3 cm in diameter, arising from the conus arteriosus of the right ventricle. This artery divides into right and left branches under the aortic arch, at approximately the level of the fibrocartilage between the fifth and sixth thoracic vertebrae. The entire pulmonary artery is contained within the pericardium. It is enclosed with the ascending aorta within a visceral

Pulmonary Artery Segmental Anatomy
Fig. 2. Normal anatomy of the arterial pulmonary circulation A Pulmonary artery B Aortic arch C Right pulmonary artery D Left pulmonary artery

Right lung

Segmental arteries supplying:

1 Apical upper lobe segment

2 Posterior upper lobe segment

3 Anterior upper lobe segment

4 Apical superior lower lobe segment

5 Lateral middle lobe segment

6 Medial middle lobe segment

7 Anterior basal lower lobe segment

8 Lateral basal lower lobe segment

9 Posterior basal lower lobe segment

10 Medial basal lower lobe segment

Left lung

Segmental arteries supplying:

01 Apical posterior upper lobe segment

02 Anterior upper lobe segment

03 Superior lingular segment

04 Inferior lingular segment

05 Apical superior lower lobe segment

06 Anterior basal lower lobe segment

07 Lateral basal lower lobe segment

08 Posterior basal lower lobe segment layer of serous pericardium deriving from the base of the heart. This fibrous layer is gradually lost as the pulmonary artery divides into its right and left branches.

The right branch of the pulmonary artery (right main pulmonary artery), which is longer and larger than the left, runs horizontally to the right, behind the ascending aorta and superior vena cava and in front of the right main bronchus, to the root of the right lung, where it divides into two branches. The lower and larger of these branches goes to the middle and lower lobes while the upper and smaller branch goes to the upper lobe. The left branch of the pulmonary artery (left main pulmonary artery) is slightly shorter and smaller than the right and passes horizontally in front of the descending aorta and left main bronchus to the root of the left lung, where it divides into two branches, one for each lobe of the lung (Fig. 2).

Cranially, the pulmonary artery is connected to the concavity of the aortic arch by the ligamentum arteriosum.

Was this article helpful?

+1 0
Essentials of Human Physiology

Essentials of Human Physiology

This ebook provides an introductory explanation of the workings of the human body, with an effort to draw connections between the body systems and explain their interdependencies. A framework for the book is homeostasis and how the body maintains balance within each system. This is intended as a first introduction to physiology for a college-level course.

Get My Free Ebook


Responses

  • Lucas
    Is the right pulmonary artery larger than the left?
    8 years ago

Post a comment