Quain's elements of anatomy . ssue in variable amount, more betweenthe larger and less between the smaller groups. From the mutual compression towliich they are subjected the lobules are bounded by flattened sides, and they arecompactly fitted to each other and to the larger air-tubes and vessels of the lungs. BLOOD-VESSELS, LYMPHATICS, AND NERVES OF THE LUNGS. Pulmonary vessels.—The branches of the pulmonary artery accom-pany the bronchial tubes, but in their remote ramifications they sub-divide more frequently. The main arterial trunk runs down immediatelybehind the main bronchial trunk, giv
Quain's elements of anatomy . ssue in variable amount, more betweenthe larger and less between the smaller groups. From the mutual compression towliich they are subjected the lobules are bounded by flattened sides, and they arecompactly fitted to each other and to the larger air-tubes and vessels of the lungs. BLOOD-VESSELS, LYMPHATICS, AND NERVES OF THE LUNGS. Pulmonary vessels.—The branches of the pulmonary artery accom-pany the bronchial tubes, but in their remote ramifications they sub-divide more frequently. The main arterial trunk runs down immediatelybehind the main bronchial trunk, giving off corresponding branches as NEEVES OF THE LUNGS. 519 it proceeds. They ramify without anastomoses, and at length terminatein small arteries about xoVo^^ of an inch in diameter, which lie betweenthe alveoli, partially encircling their mouths (fig. 419, h). From thesevessels the capillary network arises, and covers each alveolus, passing inthe inter-alveolar septa between the adjacent air-cells. As was pointed Fig. Fig. 449.—Section op injected lung, including several contiguous alveoli(F. E. Scliultze). Highly magnified. a, a, free edges of alveoli; c, c, partitions between neighbouring alveoli, seen insection ; b, small arterial branch giving off capillaries to the alveoli. The looping ofthe vessels to either side of the partitions is well exhibited. Between the capUlaries isseen the homogeneous alveolar waU with nuclei of connective tissue corpuscles, andelastic fibres. out by Eainey, the capillary network in these partitions is single in thelungs of man and mammalia, although it forms a double layer in thelungs of amphibia and reptiles. The capillaries are very fine, and the network they form is so closethat the meshes are scarcely wider than the vessels themselves. Theyare very superficial, being covered only by the thin layer of tesselatedepithelium above mentioned, and in the partitions between contiguousalveoli the vessels of the network project on either
Size: 1812px × 1379px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., boo, bookcentury1800, booksubjectanatomy, booksubjecthumananatomy
