Figure 4
Ultrastructure of septum and pulmonary wall in B. gargarizans by SEM. SEM observation of the septa and pulmonary wall in B. gargarizans. The lattices include thick folds (A,B), thin folds (B,C) and the bottom (B) in the primary septa of inflated lungs, and the thin folds are located in the bottom (B). The uninflated lattices (D,E) contain thick folds (F) and thin folds (F) in the septa of uninflated lungs. Lattices (G,I), thick folds (H), spare thin folds (H) and absence of thin folds in the exposed bottom (I) in the pulmonary wall of inflated lungs. In the pulmonary wall of uninflated lungs, the lattices (J,L), thick folds (K,L) and sparse thin folds (K) shrink, becoming thick or spherical (K). B, C, E, F, H, and K show enlarged images of the boxes in A, B, D, E, G, and J, respectively. L shows an enlarged image of the thick boxes in J. The white thick arrow shows a thick fold, the white thin arrow indicates a thin fold, and the black arrow shows the boundary of an epithelial cell. Scale bar, A, D, G: 100 μm; B, H: 20 μm; C, F, I, K, L: 10 μm; E, J: 50 μm.
