Textbook of normal histology: including an account of the development of the tissues and of the organs . y enter theparenchyma in company with the blood-vessels, around which theyform net-works of non-medullated fibres; the nerve-fibres have beentraced between the tubules, where they form meshes immediatelyoutside the membrana propria. The ultimate distribution of thefibrillar and their relations to the secreting cells are still uncertain. THE URINARY ORGANS. 201 THE RENAL SINUS AND THE URETER. The greater part of the renal sinus is occupied by the dilated,pouch-like expansion of the upper ext
Textbook of normal histology: including an account of the development of the tissues and of the organs . y enter theparenchyma in company with the blood-vessels, around which theyform net-works of non-medullated fibres; the nerve-fibres have beentraced between the tubules, where they form meshes immediatelyoutside the membrana propria. The ultimate distribution of thefibrillar and their relations to the secreting cells are still uncertain. THE URINARY ORGANS. 201 THE RENAL SINUS AND THE URETER. The greater part of the renal sinus is occupied by the dilated,pouch-like expansion of the upper extremity of the excretory ductof the kidney, the ureter, embracing the pelvis and its subdivisions,the calices, and the infundibula. These cavities, together with theprotruding portions of the renal papillae, are invested by a membra-nous structure consisting of three coats, the mucous, the muscu-lar, and the fibrous. The mucous coat is covered with stratifiedsquamous epithelium, which comprises relatively few layers of cells,and is frequently termed transitional, in view of the rapid change Fig. Transverse section of human ureter: a, irregular lumen, lined by mucous membrane, which con-sists of epithelium (&), tunica propria (c),and submucous tissue (d); e,f, longitudinal and circularbundles of muscular tunic ; gt additional longitudinal muscular bundles ; h, fibrous tissue ; i, blood-vessels. from the columnar elements of the deep layer to the squamous onesof the superficial stratum. The tunica propria, or stroma of themucous membrane, consists of a felt-work of fibro-elastic bundles,contains a few small racemose glands, and passes insensibly intothe inconspicuous submucous tissue. The muscular coat isarranged as an inner longitudinal and an outer circular layercomposed of bundles of involuntary muscle cells. On the papillaethe circular bundles are especially well developed, enclosing the renaltissue somewhat as a sphincter. The outer fibrous coat consists ofirregularly-p
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Keywords: ., bookauthorpiersolgeorgeageorgea, bookcentury1800, bookdecade1890
