The Journal of experimental zoology . of an oblique plane. Thelatter change is in reality partial pronation. The more lateral,which is morphologically the preaxial (radial) border, becomesventral, the pollex Ijdng on this side. The hand broadens outand the fore arm becomes somewhat flattened also. The elbowjoint is now slightly flexed towards the ventral side (fig. 8). Upto this point the limb has no motility, the changes which have beendescribed being due to growth and not to muscular action. The description of the normal development is given here merely for con-venience, and only those phase
The Journal of experimental zoology . of an oblique plane. Thelatter change is in reality partial pronation. The more lateral,which is morphologically the preaxial (radial) border, becomesventral, the pollex Ijdng on this side. The hand broadens outand the fore arm becomes somewhat flattened also. The elbowjoint is now slightly flexed towards the ventral side (fig. 8). Upto this point the limb has no motility, the changes which have beendescribed being due to growth and not to muscular action. The description of the normal development is given here merely for con-venience, and only those phases which concern the experiments are subject is fully treated in papers by Gotte (79), Strasser (79), Rabl (01),with especial emphasis on external form and skeleton. Miss Byrnes (98 a) hasdescribed the relation of the limb bud to the body wall and myotomes in theearly stages. 420 ROSS G. HARRISON The third and fourth digits appear successively on the ulnar(dorsal) border of the hand, first as nodules which slowly elon-.
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Keywords: ., bookauthorwi, bookcentury1900, bookdecade1910, booksubjectzoology
