. Human embryology and morphology. Embryology, Human; Morphology. 292 HUMAN EMBRYOLOGY AND MOEPHOLOGY. the axis of the body, (2) to rotate the leg outwards so that the extensor surface of the knee is directed upwards, with the great toe in front and the little toe behind. (3) The arm, on the other hand, would require to be rotated inwards to bring the elbow (extensor surface) into the dorsal position. The rotation which brings the embryonic limbs into the adult position occurs at the junction of the limb girdle with the trunk. Rotation at the Limb Girdle.—To understand the extent of this rotat
. Human embryology and morphology. Embryology, Human; Morphology. 292 HUMAN EMBRYOLOGY AND MOEPHOLOGY. the axis of the body, (2) to rotate the leg outwards so that the extensor surface of the knee is directed upwards, with the great toe in front and the little toe behind. (3) The arm, on the other hand, would require to be rotated inwards to bring the elbow (extensor surface) into the dorsal position. The rotation which brings the embryonic limbs into the adult position occurs at the junction of the limb girdle with the trunk. Rotation at the Limb Girdle.—To understand the extent of this rotation it is best to compare the scapula and ilium and pick out their corresponding points. The extensors of the thigh and arm may be taken as guides. The long head of the triceps and rectus femoris of the quadriceps manifestly correspond; their points of origin—the anterior border of the ilium and axillary neural. •ost. root gang. muscle plate sp. nerue basis of head of humerus nerue of exten. asp. nerves of flex. asp. {:} nerve to somatopleure somatopleure Fig. 237.— Section of the Arm Bud of a human embryo at the end of the 4th week. (Alex. Low.) border of the scapula—may be regarded as homologous points. The other corresponding points are shown in Fig. 236. The sacral articular surface of the ilium corresponds to part of the supra-spinous fossa. To restore the limb girdles to their primitive and corresponding positions, the scapula has to be rotated so that. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Keith, Arthur, Sir, 1866-1955. London : E. Arnold
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectembryol, bookyear1902
