Organ
Left superior lobe
Upper left lobe including the lingula
High-yield
A common pattern combines S1 and S2 as apicoposterior, with S3 anterior and S4-S5 in the lingula.
Overview
The left superior lobe lies above and anterior to the oblique fissure. Its upper division reaches the apex, while its lingular division extends beside the heart.
Reference facts
- Location
- Anterosuperior left lung, including the apex and lingula
- Parts
- Apicoposterior S1+2 and anterior S3; superior lingular S4 and inferior lingular S5
- Blood supply
- Superior lobar and lingular branches of the left pulmonary artery
- Innervation
- Left pulmonary plexus
- Relations
- Cardiac notch at the anterior border; aortic arch and thoracic inlet structures medially and superiorly
- Function
- Gas exchange in the left upper and lingular territories
Clinical correlation
An apical lesion may involve structures at the thoracic inlet. Invasion of sympathetic fibers or the lower brachial plexus can produce neurological signs in addition to lung findings.
Frequently asked questions
Where is the left superior lobe located?
The left superior lobe lies anterosuperior left lung, including the apex and lingula.
What does the left superior lobe do?
Gas exchange in the left upper and lingular territories.
What are the parts of the left superior lobe?
Apicoposterior S1+2 and anterior S3; superior lingular S4 and inferior lingular S5.
What is the blood supply of the left superior lobe?
Superior lobar and lingular branches of the left pulmonary artery.