| Lab 15 Urinary System: 1) Index 2) Introduction 3) Things to Identify 4) Kidney I 5) Kidney 2 6)Renal Papillae and Pelvis 7) Ureter 8) Bladder 9) Urethra 10) Practical |
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Ureters
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| #144 - Ureter, human, 1.5mm, H & E |
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Examine this specimen with the lowest power objective and note the stellate-shaped lumen of the ureter surrounded by a mucosa of epithelial cells, layers of muscle and adventitia. Observe that the epithelium is transitional lying on a supporting basement membrane. The smooth muscle is arranged as a inner longitudinal layer and an outer circular layer. The muscle layers may not be distinctly separated. In regions of the ureter close to the urinary bladder, another external coat of longitudinally arranged smooth muscle can be seen. Does the specimen on your slide exhibit this third coat of muscle? How would these muscular layers appear if the section were cut longitudinally? The adventitia contains loosely arranged C.T.and many blood vessels. It blends into the pelvic fascia. References: p. 332-333 - Gartnerr p. 595-596 - Ross |
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This is a cross section of the Ureter, indicated by the red arrow. The easiest way to remember this is it's STELLATE shaped lumen. It has transitional epithelium indicated by the green arrows. It has two layers of smooth muscle surrounding it, an Inner Longitudinal and a Outer Circular layer. The blue arrow is pointing to the inner longitudinal layer. Near the bladder it picks up a third outer longitudinal layer. Red arrow - Ureter Lumen Green arrow - Transitional Epithelium of Ureter Blue arrow - Inner Longitudinal Muscle Layer
Here is a closer look at the Transitional Epithelium of the Ureter indicated by the Red arrow. Remember to keep in mind, if you see a Stellate shaped lumen and Transitional epithelium you know you are looking at the Ureter. Red arrow - Transitional Epithelium of Ureter |
Ureter Cross Section
Ureter Epithelium |
