Physiology and biochemistry in modern medicine . t of the rib makes near its neck, together withthe arch of the shaft, which is directed downward and forward, has theeffect of causing the transverse rotation of the neck of the rib to be 315 316 THE RESPIRATION converted into an upward movement, -which is greatest in that part of theshaft lying parallel to the axis of rotation of the neck (Fig. 111). The upper ribs from the first to the fifth form a cone-shaped top to thethorax, whereas the lower ones form a vertical series, each being situatedalmost directly above its neighbor. The upper set i
Physiology and biochemistry in modern medicine . t of the rib makes near its neck, together withthe arch of the shaft, which is directed downward and forward, has theeffect of causing the transverse rotation of the neck of the rib to be 315 316 THE RESPIRATION converted into an upward movement, -which is greatest in that part of theshaft lying parallel to the axis of rotation of the neck (Fig. 111). The upper ribs from the first to the fifth form a cone-shaped top to thethorax, whereas the lower ones form a vertical series, each being situatedalmost directly above its neighbor. The upper set is arranged for theexpansion of the conical upper lobe of the lungs, the lower for the ex-pansion of the more or less cylindrical lower lobes. During inspirationthe anteroposterior diameter of the conical portion of the thorax in-creases, because the ribs, together with the sternal connections, movethrough progressively increasing arches, and each lower rib tends to over-ride the rib just above. The maximal rise of the ribs from the first to the.
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Keywords: ., bookcentury1900, bookdecade1910, bookpubli, booksubjectphysiology
