Bronchopulmonary Segments of the Right Lung

The right lung has 3 lobes and 10 bronchopulmonary segments.

Segments by Lobe

Superior (Upper) Lobe — 3 Segments

Supplied by the right superior lobar bronchus (eparterial bronchus), which divides into three segmental bronchi:

No.	Segment	Position
1	Apical	Upper part of upper lobe; projects into the root of the neck
2	Posterior	Posterior part of upper lobe
3	Anterior	Anterior part of upper lobe

Middle Lobe — 2 Segments

Supplied by the right middle lobar bronchus, which divides into two segmental bronchi:

No.	Segment	Position
4	Lateral	Lateral part of middle lobe
5	Medial	Medial part of middle lobe, related to heart

Inferior (Lower) Lobe — 5 Segments

Supplied by the right inferior lobar bronchus, which divides into five segmental bronchi:

No.	Segment	Position
6	Superior (Apical)	Uppermost part of lower lobe; lies posteriorly
7	Medial basal	Medial basal part (cardiac segment); related to heart
8	Anterior basal	Anterior basal part
9	Lateral basal	Lateral basal part
10	Posterior basal	Posterior basal part; deepest, most dependent posteriorly

Summary Table — Right Lung

Lobe	No.	Segment Name
Superior	1	Apical
Superior	2	Posterior
Superior	3	Anterior
Middle	4	Lateral
Middle	5	Medial
Inferior	6	Superior (Apical)
Inferior	7	Medial basal
Inferior	8	Anterior basal
Inferior	9	Lateral basal
Inferior	10	Posterior basal

Clinically Important Segments — Right Lung

Segment	Clinical Relevance
Superior (apical) of lower lobe (S6)	Most dependent in supine position — aspirated material and foreign bodies lodge here
Posterior basal (S10)	Most dependent in prone position
Medial basal (S7)	Also called cardiac segment; adjacent to pericardium
Apical of upper lobe (S1)	Site of primary tuberculosis focus (Simon’s focus in reactivation TB)
Posterior of upper lobe (S2)	Common site of reactivation tuberculosis