The laws and mechanics of circulation, with the principle involved in animal movement . cates, the fibres runtransversely ; the muscular fibres spring from the internal sur-face of the cartilages of the six inferior ribs, lumbar fascia, crestof ilium, and Pouparts ligament; while the fibrous aponuerosisin which the muscle-fibres terminate inosculates with that fromthe opposite muscle in the linea alba, passing under the rec-tus abdominis, forming the inner layer of its sheath, save atthe lower portion, where the fibres pass in front of it, blendingwith the fibrous layer from the internal obliq
The laws and mechanics of circulation, with the principle involved in animal movement . cates, the fibres runtransversely ; the muscular fibres spring from the internal sur-face of the cartilages of the six inferior ribs, lumbar fascia, crestof ilium, and Pouparts ligament; while the fibrous aponuerosisin which the muscle-fibres terminate inosculates with that fromthe opposite muscle in the linea alba, passing under the rec-tus abdominis, forming the inner layer of its sheath, save atthe lower portion, where the fibres pass in front of it, blendingwith the fibrous layer from the internal oblique muscle (Fig. 122),the rectus muscle having three layers of fibrous aponeurosis atthis point for supporting the muscle, strain tending to fall in THE ACTION IN THE TKAXSVKKSALES. 305 this locality (Fig. 120, E), from the weight in the viscera;hence this circumstance. And for giving the transverse mus-cles a firm point from which to contract upon the abdominalviscera, the posterior aponeurosis forming the lumber fascia{Fig. 122) is divided up into three broad leaflets, the anterior. Fig. 122.—Showing direction of the fibres of the transversalis muscle.—Gray. and middle being inserted into the base and apex of the trans-verse processes of the lumbar vertebrse, and the posterior intothe powerful aponeurosis of the latissimus dorsi, so that forcewith security are insured. Now, then, contraction in thetransversales must inevitably diminish the transverse axis inthe abdomen ; and should this occur simultaneously with con-traction in the external obliqui (which is the case), it is easilyperceived that it would assist the action in these muscles cor- 306 THE ACTION IN THE INTERNAL OBLIQUE MUSCLES. respondingly. It could not do otherwise, in the very natureof things. In short, the whole anterior walls of the abdomenfrom sternum to pubes are pulled backward by contraction inthese muscles, thereby increasing pressure in the abdomen cor-respondingly for compelling the viscera toward
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