. Compendium of histology. Histology. THE LUNGS. 159 thoracic cavity compels the pulmonary alveoli to maintain a certain expansion permanently. In consequence of their great distensibility, the lungs follow the expansion of the thorax. By means of their elastic power, and assisted by the muscles of their canals, they contract at each expiration,. Fig. 147.—Transverse section through the pulmonary substance of a child of nine months. A number of pulmonary cells, b, surrounded by the elastic fibrous net-work, which bound them in a trabecula-like manner, and, with the thin structureless membrane,
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. Compendium of histology. Histology. THE LUNGS. 159 thoracic cavity compels the pulmonary alveoli to maintain a certain expansion permanently. In consequence of their great distensibility, the lungs follow the expansion of the thorax. By means of their elastic power, and assisted by the muscles of their canals, they contract at each expiration,. Fig. 147.—Transverse section through the pulmonary substance of a child of nine months. A number of pulmonary cells, b, surrounded by the elastic fibrous net-work, which bound them in a trabecula-like manner, and, with the thin structureless membrane,