3D CONTENT
3D HEART ANATOMY

ROOT OF PULMONARY TRUNK

Author: Dr. Bogdan Leahu
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Root of pulmonary trunk anatomy 360-degree interactive viewer showing pulmonary valve and surrounding structures
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Root of Pulmonary Trunk - Overview, Preview from the app.

TABLE OF CONTENTS

ROOT OF PULMONARY TRUNK

  • Initial segment of pulmonary artery arising from right ventricle
  • Supports pulmonary valve
  • Directs deoxygenated blood from right ventricle to lungs
  • Components:
    • Pulmonary valve leaflets
    • Proximal portion of pulmonary trunk
  • Ensures smooth blood flow and proper valve function

PULMONARY VALVE

Pulmonary valve 360-degree interactive viewer showing semilunar valve between right ventricle and pulmonary artery
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Pulmonary Valve, Preview from the app.

  • Semilunar valve between right ventricle and pulmonary artery
  • Regulates blood flow from heart to lungs
  • Composed of three semilunar leaflets:
    • Right semilunar leaflet
    • Left semilunar leaflet
    • Anterior semilunar leaflet
  • Opens during ventricular systole
    • Allows deoxygenated blood into pulmonary artery
  • Closes during diastole
    • Prevents backflow into right ventricle

OPENING OF PULMONARY TRUNK

Opening of pulmonary trunk showing passage for blood ejection from right ventricle guarded by pulmonary valve
Opening of Pulmonary Trunk - Sourced from the app 3D HEART ANATOMY
  • Passage for blood ejection from right ventricle
  • Blood enters pulmonary artery during ventricular contraction
  • Guarded by pulmonary valve
  • Ensures unidirectional blood flow

PULMONARY VALVE LEAFLETS

Pulmonary valve leaflets 360-degree interactive viewer showing right, left, and anterior semilunar leaflets
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Pulmonary Valve Leaflets, Preview from the app.

Right Semilunar Leaflet

  • Named for anatomical position
  • Positioned on right side relative to other leaflets

Left Semilunar Leaflet

  • Named for position on left side
  • Located opposite left side of aorta

Anterior Semilunar Leaflet

  • Located at front of valve
  • Faces anteriorly

Leaflets function together for proper valve operation

SINUSES OF PULMONARY TRUNK

Sinuses of pulmonary trunk 360-degree interactive viewer showing right, left, and anterior sinuses
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Sinuses of Pulmonary Trunk, Preview from the app.

  • Three small dilations at base of pulmonary trunk
  • Located just behind each semilunar leaflet
  • Important for valve function

Named According to Anatomical Position

Right Sinus
  • Positioned relative to aorta on right
Left Sinus
  • Located opposite left side of aorta
Anterior Sinus
  • Situated at front facing sternum

Sinuses facilitate valve opening and closing during cardiac cycle

INTERLEAFLET TRIANGLES OF PULMONARY TRUNK

Interleaflet triangles of pulmonary trunk showing triangular areas between valve leaflet attachments
Interleaflet Triangles of Pulmonary Trunk - Sourced from the app 3D HEART ANATOMY
  • Triangular areas of arterial wall
  • Located between pulmonary valve leaflet attachments
  • Contribute to leaflet flexibility
  • Allow effective valve movement during cardiac cycle
  • Enable proper opening and closing

SUPRAVALVULAR RIDGE OF PULMONARY TRUNK

  • Circular region at level of commissures
  • Commissures are points where leaflets meet
  • Located at junction of semilunar leaflets

BIBLIOGRAPHY

1. Drake RL, Vogl AW, Mitchell AWM. Gray's Anatomy for Students. 4th ed. Philadelphia: Elsevier; 2020. Chapter 3: Thorax.

2. Standring S, editor. Gray's Anatomy: The Anatomical Basis of Clinical Practice. 42nd ed. Edinburgh: Elsevier; 2021. p. 996-1046.

3. Moore KL, Dalley AF, Agur AMR. Clinically Oriented Anatomy. 8th ed. Philadelphia: Wolters Kluwer; 2018. p. 127-162.

QUICK FACTS: ROOT OF PULMONARY TRUNK

Key questions answered about this anatomy topic

Q: What is the primary function of the root of pulmonary trunk?

Answer: To direct deoxygenated blood from right ventricle to lungs. The root of pulmonary trunk is the initial segment of the pulmonary artery arising from the right ventricle, which directs deoxygenated blood from the right ventricle to the lungs for oxygenation.

Q: How many semilunar leaflets compose the pulmonary valve?

Answer: Three leaflets. The pulmonary valve is composed of three semilunar leaflets: the right semilunar leaflet, left semilunar leaflet, and anterior semilunar leaflet.

Q: What type of valve is the pulmonary valve?

Answer: Semilunar valve. The pulmonary valve is a semilunar valve located between the right ventricle and the pulmonary artery, regulating blood flow from the heart to the lungs.

Q: When does the pulmonary valve open?

Answer: During ventricular systole. The pulmonary valve opens during ventricular systole to allow deoxygenated blood to flow from the right ventricle into the pulmonary artery and towards the lungs.

Q: What structure guards the opening of the pulmonary trunk?

Answer: Pulmonary valve. The opening of the pulmonary trunk is guarded by the pulmonary valve, which ensures unidirectional blood flow from the right ventricle to the pulmonary artery.

Want to test yourself? Try the interactive quiz above!

⋮⋮ Root of Pulmonary Trunk Quiz
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