Archive image from page 442 of Discovery reports (1932) Discovery reports discoveryreports05inst Year: 1932 THE URINARY SYSTEM: KIDNEYS 427 are distributed in continuous bands round their peripheries—broken, however, where the partitioning into individual renculi is beginning to take place. This is seen in kidneys of foetuses about 1 -o m. in length. In kidneys of foetuses about 2-0 m. in length, in which the renculi have rounded themselves off from the lobules, the embryonic area forms a continuous but only just discernible band round the outer edge of the cortex. The band becomes less dist
Archive image from page 442 of Discovery reports (1932) Discovery reports discoveryreports05inst Year: 1932 THE URINARY SYSTEM: KIDNEYS 427 are distributed in continuous bands round their peripheries—broken, however, where the partitioning into individual renculi is beginning to take place. This is seen in kidneys of foetuses about 1 -o m. in length. In kidneys of foetuses about 2-0 m. in length, in which the renculi have rounded themselves off from the lobules, the embryonic area forms a continuous but only just discernible band round the outer edge of the cortex. The band becomes less distinct as the renculus grows. In kidneys from foetuses about 3-0 m. long the embryonic areas are no longer found. Fig. 28. Diagrams illustrating the formation of the capsule and tubule in the Fin whale. A1. Collecting tube approaching the periphery of the lobule, producing a thickening of the periphery, the ' Anlage' of the capsule. A2. A bifurcate collecting tube approaching the periphery, with the formation of two basin-shaped thickenings. B. A further stage. The ' Anlagen' have begun to grow inwards. C. The cavity has appeared in each 'Anlage', as it continued to grow inwards. D. The 'Anlage' has undergone rotation and inward growth. The inner wall of the basin now looks towards the periphery and is beginning to thicken. E. The young capsule is now connected to the periphery by a slender cord of cells, and the thickened wall shows signs of folding to form the future glomerulus. The collecting tube has meanwhile grown round towards the tip of the young capsule, from which a process is extending to meet it. F. The glomerular wall of the capsule shows marked folding and the opposite wall of the capsule is thin. A long U-shaped extension has grown out from the capsule to the collecting tube. At the junction of the collecting tube and this extension, which is the rudiment of the future tubule, a thick plug of cells still occludes the canal. G. A stage farther than F. The young
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