. A treatise on practical anatomy: for students of anatomy and surgery . verse processes of dorsal —Pass downward and outward, and are in-serted posterior to angles of — Origin—Fibres arise from inner surface of —Into ribs — Sterni. Origin—Lower part of inner surface of sternum and costal —Costal cartilages of third, fourth, and fifth — The diaphragm is a fibro-muscular partition be- THE DIAPHRAGM. 193 tween the thoracic and abdominal cavi
. A treatise on practical anatomy: for students of anatomy and surgery . verse processes of dorsal —Pass downward and outward, and are in-serted posterior to angles of — Origin—Fibres arise from inner surface of —Into ribs — Sterni. Origin—Lower part of inner surface of sternum and costal —Costal cartilages of third, fourth, and fifth — The diaphragm is a fibro-muscular partition be- THE DIAPHRAGM. 193 tween the thoracic and abdominal cavities. It arisesposteriorly by two crura, which arc flat, ligamentousbands attached to the anterior surface of the bodies ofthe lower four lumbar vertebrae; also, it arises from theligamenta arcuata interna and externa, wliich are fibrousarches thrown over the psoas magnus and quadratus lum-borum muscles, the ligamentum arcuatum internumbeing attached to the side of the body of the first lumbarvertebra and attached to tlie base of the transverse process. Fig. 87.—The Diaphkagm. 1,2,3, central cordiform tendcm; 4, middle leaflet; 5, ligamentum arcuatum exter-num; 6, ligamentum arcuatum internum ; 8, right crus ; 10, left crus ; U, aortic opening;12, oesophageal opening ; 13, opening for vena cava; 14, psoas magnus: 15, quadratus lura-borum. of the second lumbar vertebra; it is continuous with thecrus. The ligamentum arcuatum externum extends fromthe base of transverse process of second lumbar vertebrato the apex of the last rib. The diaphragm also arisesby a number of digitations from the inferior circumfer-ence of the chest; therefore, from the tip of the eleventhrib, the costal cartilages of the false ribs, and the tipof the ensiform cartilage. From these points of originthe fibres pass inward to the central tendon, which con-sists of a trefoil aponeurosis of white, fibrous tissue. 13 194 PRACTICAL ANATOMY. There are three important openmgs in the diaphragm:1.
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectanatomy, bookyear1891
