[TA] one of the divisions of the lobar bronchus that supplies a bronchopulmonary segment. In the right lung there are commonly ten: in the superior lobe, the apical (B1) segmental bronchus, bronchus segmentalis apicalis (BI) [TA]; posterior (B2) segmental bronchus, bronchus segmentalis posterior (BII) [TA]; and anterior (B3) segmental bronchus, bronchus segmentalis anterior (BIII) [TA]; in the middle lobe, lateral (B4) segmental bronchus, bronchus segmentalis lateralis (BIV) [TA]; and medial (B5) segmental bronchus, bronchus segmentalis medialis (BV) [TA]; in the inferior lobe, superior (B6) segmental bronchus, bronchus segmentalis superior (BVI) [TA], medial basal (B7) segmental bronchus, bronchus segmentalis basalis medialis (BVII) [TA]; anterior basal (B8) segmental bronchus, bronchus segmentalis basalis anterior (BVIII) [TA]; lateral basal (B9) segmental bronchus, bronchus segmentalis basalis lateralis (BIX) [TA]; and posterior basal (B10) segmental bronchus, bronchus segmentalis basalis posterior (BX) [TA]. In the left lung there are commonly nine: in the superior lobe, the apicoposterior (B1+2) segmental bronchus, bronchus segmentalis apicoposterior (BI+II) [TA]; anterior (B3) segmental bronchus, bronchus segmentalis anterior (BIII) [TA]; superior lingular (B4) segmental bronchus, bronchus lingularis superior (BIV) [TA]; and inferior lingular (B5) segmental bronchus, bronchus lingularis inferior (BV) [NA]; in the inferior lobe, superior (B6) segmental bronchus, bronchus segmentalis superior (BVI) [TA]; medial basal (B7) segmental bronchus, bronchus segmentalis basalis medialis (cardiacus) (BVII) [TA], anterior basal (B8) segmental bronchus, bronchus segmentalis basalis anterior (BVIII) [TA]; lateral basal (B9) segmental bronchus, bronchus segmentalis basalis lateralis (BIX) [TA]; and posterior basal (B10) segmental bronchus, bronchus segmentalis basalis posterior (BX) [TA]. SYN: bronchus segmentalis [TA].