AN ANALYSIS OF VARIATIONS OF THE SEGMENTAL BRONCHI OF THE RIGHT LOWER LOBE IN FIFTY CHINESE LUNGS
- VernacularTitle:右肺下叶支气管及血管——Ⅰ.右肺下叶支气管
- Author:
Kenpen WANG
;
Hopi TAI
- Publication Type:Journal Article
- From:
Acta Anatomica Sinica
1953;0(01):-
- CountryChina
- Language:Chinese
-
Abstract:
The pattern of branching and distribution of the segmental bronchi in the rightlower lobe of 50 adult Chinese lungs were studied and the following results were ob-tained. 1. In 98% of the cases the superior segmental bronchus (B~6) arises as a single stem,which is either divided into 2 branches (86%) or 3 branches (12%). In the formercase, the prevailing pattern (68%) has the formula B_(a+b)~6 and B_6c. In 22% of the cases, the superior segment is obliquely fitted to the basal segmentsof the lower lobe, and in the remaining 76% it caps the basal segments horizontally. Only in one instance (2%), B~6 arises as two separate stems. In 38% of the cases the subsuperior bronchus proper (B~*) is present. In some cases(6%) of this group there are two B~* in the same lobe. The accessory subsuperior bronchus (BX_(10)~*) is found in 86% of the cases. It maybe represented by 1--3 stems. The B~x or BX_(10)~* almost always distributes to at least the posterior section of thelung but it may spread medially to the paravertebral area or laterally to the postero-lateral zone. 2. The percentages of occurrence of types Ⅰ, Ⅱ, Ⅲ and Ⅳ of the medial basal bron-chus (B~7) are 38%, 30%, 16% and 16% respectively. The anterior basal bronchus (B~8) is remarkably constant in occurrence and pattern,80% of B~8 bifurcated into B_a~8 and B_b~8, 18% is expanded by the inclusion of the sub-segmental bronchus of adjoining segments, and 2% is defective. The lateral basal bronchus (B~9) divides typically into B_a~9 and B_b~9 in 82% of thecases. Only 2% of B~9 is expanded, this is due to the inclusion of the displaced B_b~8. Inthe remaining 16%, B~9 is defective. In such instances its two subsegmental bronchiarise independently, one has developed at the usual site of B~9, the other arises as a dis-placed branch usually from main trunk of B~(10). In all specimens, the posterior basal bronchi (B~(10)) divides into B_a~(10) and B_b~(10). Onlyin two specimens, B_b~(10). is expanded by inclusion of the displaced B_b~7. 3. The lengths and the relative levels of the segmental bronchi of the right lowerlobes were measured.
