OCR Text |
Show 760 PROF. W. H. FLOWER ON MLURUS FULGENS. [Nov. 15, The left lung (fig. 5) consists of two triangular lobes (V and L2), separated almost completely by a horizontal fissure. One of the main divisions of the bronchus enters into each. The upper lobe is slightly smaller than the lower one. Fig. 5. Anterior surface of the lungs; two-thirds the natural size. Rl. Right upper lobe. R2. Right middle lobe. R3. Right lower lobe. A. Azygous lobe. Ll. Left upper lobe. L2. Left lower lobe. The right lung has an upper (R1) and lower lobe (R3) corresponding closely in size and form with those of the left lung ; and, in addition, a small middle lobe (R2) between the two, and a pointed "azygous" lobe (A) lying in front of the inner edge of the lower lobe. The two latter receive bronchial branches from the lower main division of the right bronchus, the upper division being confined in its distribution to the upper lobe of the lung. All four lobes are slightly connected together by lung-tissue at their base. The thymus is very conspicuous. It is an oblong compressed, or rather trihedral, body, with one edge turned forwards and to the right and one surface backwards, and of a pale flesh-colour. Its length is 1*5", its greatest thickness *5". It lies in front of the upper part of the heart and great vessels-its lower end, which is rounded and rather larger than the upper, lying over the anterior surface of the right ventricle, and the upper end in front of the first |