Contribution to the topographical anatomy of the thorax in the foetus at term and the new-born child / by George S. Huntington.

  • George Sumner Huntington
Date:
[1897?]
Catalogue details

Licence: Public Domain Mark

Credit: Contribution to the topographical anatomy of the thorax in the foetus at term and the new-born child / by George S. Huntington. Source: Wellcome Collection.

Provider: This material has been provided by The University of Glasgow Library. The original may be consulted at The University of Glasgow Library.

    8/66 page 330
    The hilus of the more advanced lung occupies a relatively greater area on the mediastinal surface. This is more especially marked in the inferior portion, resulting in a shortening of the ligamentum latum. In the further development of the external form of the left lung the changes indicated above lead to the establishment of two quite distinct types. Instances of these are given in Figs. XIV to XVII, representing the sternocostal and mediastinal surfaces of two left lungs at term. Type 1. Lung with well-developed cardiac incisure (Figs. XIV, XV, and XVIII). The quadrangular form, noted as appearing in IX and X, is here still further developed, due to the great antero-posterior extent of the supe- rior lobe and marked development of the anterior portion of the same above the cardiac incisure. The quadrangular marginal process forming the upper limit of the latter is especially prominent. The anterior marginal fissure is present and distinct, appearing both on the sternocostal and mediastinal surfaces. The cardiac incisure is deep, forming three sides of a rectangle, bounded below by the prominent incurve of the hook-like lingula. The main interlobar incisure on the sternocostal surface meets the inferior margin at a point which would correspond to the vertical prolonga- tion downward, across the root of the lingula, of the bottom of the cardiac incisure. On the mediastinal surface the inferior lobe presents an extensive area. The course of the main interlobar incisure, in returning to the anterior margin of the hilus, on the mediastinal surface, follows the type indicated in the earlier stages in Fig. III. The incisure meets the anterior border of the hilus nearly at the middle, and a large triangular area, belonging to the mediastinal aspect of the inferior lobe, presents in its anterior and larger part a concavity for adaptation to the left surface of the pericardium, its smaller posterior and inferior segment forming the prominent triangular oesophageal surface. Type 2. Absence of cardiac incisure. Assimilation of external form to that of right lung. In strong contradistinction to the preceding form is the superficial con- figuration of the lung shown in Figs. XVI and XVII. The entire appearance of the lung suggests the structure usually encoun- tered on the right side. The anterior margin is nearly vertical. There is no cardiac incisure. The anterior marginal fissure is well developed and crosses the sternocostal surface so as to nearly intersect the main inter- lobar incisure. The anterior margin turns with an obtuse angle into the superior division, sloping slightly upward and backward to the apex. The upper lobe, compared with the first type, is slightly less quadran- gular. Possibly the absence of the cardiac incisure, and the consequent increase in lung substance along the anterior and inferior marginal por- tions of the lung, accounts for the somewhat smaller sagittal extent of the upper part of the superior lobe.
    digitised image 1
    digitised image 2
    digitised image 3