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Questions and Answers
The medulla involves renal pyramids.
The medulla involves renal pyramids.
True
The thin segment of Henle loop contains RBCs in the lumen.
The thin segment of Henle loop contains RBCs in the lumen.
False
The papillary region faces the major calyx.
The papillary region faces the major calyx.
False
The terminal portion of collecting tubules is called the papillary duct and is near the tip of the papilla.
The terminal portion of collecting tubules is called the papillary duct and is near the tip of the papilla.
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The mucosa of the urinary passages consists of transitional epithelium and lamina propria connective tissue.
The mucosa of the urinary passages consists of transitional epithelium and lamina propria connective tissue.
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All parts of the urinary passages are covered by the peritoneum.
All parts of the urinary passages are covered by the peritoneum.
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An undistended bladder consists of 5-6 cells thick with rounded cells.
An undistended bladder consists of 5-6 cells thick with rounded cells.
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The muscular layer in the bladder consists of only two muscle layers: inner longitudinal and outer circulatory.
The muscular layer in the bladder consists of only two muscle layers: inner longitudinal and outer circulatory.
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The tunica mucosa of the urinary bladder consists of transitional epithelium resting on the lamina propria of connective tissue.
The tunica mucosa of the urinary bladder consists of transitional epithelium resting on the lamina propria of connective tissue.
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Muscularis in the ureter is much thicker than in the bladder.
Muscularis in the ureter is much thicker than in the bladder.
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The tunica submucosa in the urinary bladder is highly vascular and rich in elastic fibers.
The tunica submucosa in the urinary bladder is highly vascular and rich in elastic fibers.
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The urethra is involved in both urinary and reproductive functions in men.
The urethra is involved in both urinary and reproductive functions in men.
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Study Notes
The Medulla
- Renal pyramids are located in the medulla, with their base adjacent to the cortex and apex forming the renal papilla.
- The renal papilla empties urine into the Minor Calyx in the kidney.
- The medulla contains straight tubules and the loop of Henle, which consists of thick and thin ascending and descending segments, forming a U-shaped structure.
- The thin segment of the Henle loop resembles blood capillaries, but can be distinguished by the absence of red blood cells in the lumen.
Papillary Region
- The papillary region faces the Minor Calyx.
- The terminal portion of the collecting tubules is called the papillary duct, located near the tip of the papilla.
- The papillary duct has a wide lumen and is lined with columnar cells.
- The collecting tubules in the papillary region are bounded by the cuboidal cells.
Bladder and Urinary Passages
- The urinary passages consist of the calyces, pelvis, ureter, bladder, and urethra.
- The calyces, pelvis, ureter, and bladder have a similar structure, with gradual wall thickening towards the bladder.
- The mucosa of the urinary passages consists of transitional epithelium and lamina propria.
- All urinary passages are covered by an adventitia membrane, except for the upper part of the bladder, which is covered by peritoneum.
Bladder Structure
- Undistended bladder has 5-6 cell layers with rounded cells, which stretch to 3-4 cell layers with squamous superficial cells when full.
- Muscular layer consists of inner longitudinal, outer circular, and additional outer longitudinal muscle layers in the lower part.
- Muscle fibers in the bladder run in three directions: inner longitudinal, middle circular, and outer longitudinal.
Urinary Bladder Layers
- Four tissue layers: Tunica Mucosa, Submucosa, Tunica Muscularis, and Tunica (Adventitia).
- Tunica Mucosa: Transitional epithelium on the lamina propria of the connective tissue.
- Submucosa: Vascular layer with rich elastic fiber layer.
- Tunica Muscularis: Inner, middle, and outer smooth muscle layers.
- Tunica (Adventitia): Serosa connective tissue.
Ureter Structure
- Three tissue layers: Mucosa, Muscularis, and Serosa (Adventitia).
- Mucosa has fewer cell layers than the bladder.
- Muscularis is much thinner than the bladder.
Urethra
- A tube that carries urine from the bladder to the exterior.
- In men, it also carries sperm.
- In women, it is only a urinary organ.
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Description
This quiz covers the anatomy of the medulla and papillary region in the kidney, including the structure and function of renal pyramids and Henle's loop.
