Applied anatomy and kinesiology, the mechanism of muscular movement . en the limbs arein the position in which quadrupeds use them—nearly at rightangles with the body. When we come to study posture we find other instances of lackof adaptation of the body to erect position. The spinal columnseems to have been primarily intended for swimming and crawling 246 THE UPRIGHT POSITION animals, later adapted to vise by quadrupeds, only at a compara-tively recent time put to use in the erect position and not yetsuited fully to that position. It is helpful, therefore, to notice someof the conditions pres
Applied anatomy and kinesiology, the mechanism of muscular movement . en the limbs arein the position in which quadrupeds use them—nearly at rightangles with the body. When we come to study posture we find other instances of lackof adaptation of the body to erect position. The spinal columnseems to have been primarily intended for swimming and crawling 246 THE UPRIGHT POSITION animals, later adapted to vise by quadrupeds, only at a compara-tively recent time put to use in the erect position and not yetsuited fully to that position. It is helpful, therefore, to notice someof the conditions present in the skeleton of the lower vertebratespreliminary to a study of the erect posture. The general form of the trunk, common to all vertebrates, isroughly cylindrical with a cross-section like that shown in Fig. muscular body wall contains the vital organs and the spinalcolumn is placed in one side of it. This is the fundamental struc-ture that must be adapted to the erect position. Let us first noticehow it is adapted to the condition of the EXTERNAL OBLIQUE_—INTERNAL OBLIQUEJI—TRANSVERSA LIS -LATISSIMUS ERECTOR SPIN)£
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