Lungs
3
Plate200
NomenclatureofBronchi:Schema
Superior lobar
(eparterial)
bronchus
Right and left
main bronchi
Superior
lobar
bronchus
Superior
division
bronchus
B
1+2
(apicoposterior)
B
3
(anterior)
Lingular bronchus
Inferior lobar
bronchus
Inferior lobar
bronchus
B
7
(medial basal)
B
6
(superior,
lower lobe)
B
6
(superior, lower lobe)
Middle lobar bronchus
B
2
(posterior)
B
8
(anterior basal)
B
9
(lateral basal)
B
10
(posterior basal)
B
9
(lateral basal)
B
10
(posterior basal)
B
7+8
(anteromedial basal)
B
1
(apical)
B
1a
B
1ai
B
1aii
B
1b i
B
1b
B
1bii
B
2aii
B
2ai
B
2a
B
2bi
B
2bii
B
2b
B
3ai
B
3aii
B
3a
B
3bii
B
3b
B
3
(anterior)
B
3bi
B
6aii
B
6bi
B
6a
B
6ai
B
6b
B
6bii
B
4
(lateral)
B
4a
B
4ai
B
4aii
B
4bi
B
4bii
B
4b
B
5
(medial)
B
5a
B
5b
B
8ai
B
8a
B
8aii
B
8b
B
8bii
B
8bi
B
9ai
B
9a
B
9b
B
10a
B
9aii
B
9bi
B
9bii
B
10aii
B
10ai
B
10bi
B
10bii
B
10b
B
10c
B
7a
B
7b
B
7bi
B
7bii
B
6ci
B
6cii
B
6c
Trachea
B
1+2aii
B
1+2a
B
1+2ai
B
1+2bii
B
1+2bi
B
1+2b
B
1+2ci
B
1+2cii
B
1+2aii
H
B
1+2bii
H
B
1+2bi
H
B
1+2aii
h
B
9bi
h
B
9bii
h
B
9bii
H
B
9aii
H
B
9ai
H
B
3aii
H
B
3ai
H
B
3aii
h
B
3ai
h
B
1bi
h
B
1bi
H
B
1bii
H
B
1bii
h
B
2ai
h
B
2ai
H
B
9ai
h
B
9aii
h
B
9bi
H
B
1+2bii
h
B
1+2bi
h
B
1+2c
B
3c
B
3a
B
3ai
B
3aii
B
3bi
B
3bii
B
3b
B
4
(superior lingular)
B
6a
B
6b
B
5
(inferior
lingular)
B
4a
B
5a
B
5b
B
4b
B
4bii
B
4bi
B
4aii
B
4ai
B
6c
B
10a
B
10ai
B
10aii
B
10c
B
10ci
B
10b
B
9b
B
10cii
B
10bii
B
10bi
B
9bi
B
9aii
B
9bii
B
9ai
B
9a
B
7+8bii
B
7+8bi
B
7+8aii
B
7+8b
B
7+8a
B
7+8ai
B
1
and B
2
are combined as are B
7
and B
8
. Subsegmental,
or 4th order, bronchi are indicated by the addition of lower-
case letters a, b, or c when an additional branch is present.
Fifth order bronchi are designated by Roman numerals i
(anterior) or ii (posterior) and 6th order bronchi by Greek
letters
h
or
H
. Several texts use alternate numbers (as
proposed by Boyden) for segmental bronchi.
Variations of the standard bronchial pattern shown here
are common, especially in peripheral airways.
Nomenclature in common usage for bronchopulmonary
segments (Plates 197 and 198) is that of Jackson and
Huber, and segmental bronchi are named accordingly.
Ikeda proposed nomenclature (as demonstrated here) for
bronchial subdivisions as far as the 6th generation. For simpli-
fication on this illustration, only some bronchial subdivisions
are labeled as far as the 5th or 6th generation. Segmental
bronchi (B) are numbered from 1 to 10 in each lung,
corresponding to pulmonary segments. In the left lung,
