Fig. 2.

Two right lung specimens at 7-8 weeks. Note that a specimen with 27 mm crown-rump length (CRL) (A) carries a lung larger than those in specimens with 37 or 39 mm CRL shown in Fig. 1. Both panels include the middle and lower lobes. Star indicates an area in which the segmental bronchus VII is likely to present in the immediately anterior side of the inferior pulmonary vein (IPV). Asterisk indicates a cavity through the oval window between the right atrium (RA) and left atrium (LA). AO, aorta; B6, segmental bronchus VI; B8+9+10, a common trunk bronchus with the segmental bronchi VIII, IX, and X; ES, esophagus; SPV, superior pulmonary vein. The two panels are prepared at the same magnification. Scale bar in panel (A)=1 mm (A, B).