First stage hygiene : for the first stage examination of the Board of Education, containing the examination papers from 1903 to 1908 / by Robert A. Lyster.

  • Lyster, Robert Arthur
Date:
1909
Catalogue details

Licence: In copyright

Credit: First stage hygiene : for the first stage examination of the Board of Education, containing the examination papers from 1903 to 1908 / by Robert A. Lyster. Source: Wellcome Collection.

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    This movement takes place during respiration. The first ten pairs of ribs are attached in front to the sternum by means of cartilages—the costal cartilages,—the first five pairs having separate costal cartilages, while the second five are united to a single cartilage—the sixth. The last two pairs, the eleventh and twelfth, are not attached to the sternum at all, and are therefore called floating ribs. Fig. 5.—The Bony Thorax. These are easily pressed inwards by tight lacing. The sternum or breast bone is flat and shaped more or less like a dagger, being broader above tlian below. Viewed as a whole, the bony tliorax is of a conical sliape, being broader below than above, when not distorted by corsets. The intervals between the ribs are called intercostal spaces, and are filled up by muscles called the intercostal muscles.