Organ
Lingula
Two-segment projection of the left superior lobe
High-yield
Superior lingular is S4 and inferior lingular is S5; neither is a separate lobe.
Overview
The lingula extends below the cardiac notch along the anteroinferior left lung. It is a subdivision of the superior lobe, although its position resembles the right middle lobe.
Reference facts
- Location
- Anteroinferior projection of the left superior lobe beside the cardiac notch
- Parts
- Superior S4 and inferior S5 lingular segments
- Blood supply
- Lingular branches of the left pulmonary artery
- Innervation
- Left pulmonary plexus
- Relations
- Adjacent to the heart across pleura and pericardium
- Function
- Gas exchange in the lingular segmental territories
Clinical correlation
Lingular loss of aeration can accompany the same recurrent-collapse pattern described as middle lobe syndrome. Airway obstruction and inflammatory disease are both possible causes.
Frequently asked questions
Where is the lingula located?
The lingula lies anteroinferior projection of the left superior lobe beside the cardiac notch.
What does the lingula do?
Gas exchange in the lingular segmental territories.
What are the parts of the lingula?
Superior S4 and inferior S5 lingular segments.
What is the blood supply of the lingula?
The lingula is supplied by the lingular branches of the left pulmonary artery.