. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. Portion of the surface of the kidney, showing the tabulated appearance which results from congestion of the venous radicles. Natural size; from a speci- men prepared by Mr. Bowman. This lobulated appearance of the surface is produced by the venous radicles which are dispersed at nearly equal distances throughout the cortical substance, each receiving the blood, as will presently be shown, from the plexus surrounding the convoluted tubes. These radicles unite in an irregularly arbores- cent figure, anastomose, and form th
. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. Portion of the surface of the kidney, showing the tabulated appearance which results from congestion of the venous radicles. Natural size; from a speci- men prepared by Mr. Bowman. This lobulated appearance of the surface is produced by the venous radicles which are dispersed at nearly equal distances throughout the cortical substance, each receiving the blood, as will presently be shown, from the plexus surrounding the convoluted tubes. These radicles unite in an irregularly arbores- cent figure, anastomose, and form the several branches of the renal vein. Those on the sur- face have a tendency to converge towards a central vessel, which then dips into the interior to join the trunks of the renal vein. Thus are formed the stellated vessels, which are often very conspicuous in diseased specimens, when there has been an impeded circulation through the veins of the kidney. Between the arms of these stellae the convoluted tubes are visible on the surface (fig- 145). Ferrein supposed each of these lobules to form the base of a pyramid, the apex of the same being at the extremity of a mamillary process, and he believed that such an elongated pyra- mid might be traced continuously from one part to the other, the tissues radiating from Fig. Portion of the surface of the human kidney in- jected by the artery, t, t, tortuous tubes as seen on the surface; p, capillary plexus surrounding the tubes; e, a branch of one of the stelliform veins. Magnified forty-five diameters. (After Bowman.} a point in the mamillary process, through the cortical substance, to one of the lobular divisions on the surface. Mr. Bowman's preparations show that " each lobule contains many tortuous ducts with their capillaries, but the convolutions of any one duct are not confined to a single ; Hence it is ma- nifest that there is no natural division of the renal substance corresponding with the sup- posed
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Keywords: ., bo, booksubjectanatomy, booksubjectphysiology, booksubjectzoology
