What is the cortical labyrinth?
The cortical labyrinth contains the glomeruli, proximal convoluted tubule (PCT), macula densa, distal convoluted tubule (DCT), connecting tubule, initial collecting duct (ICT), interlobular arteries, and the afferent and efferent capillary networks.
Where is the cortical labyrinth?
region of renal cortex consisting of glomeruli and convoluted uriniferous tubules.
What are the three general types of tubules that occur in the cortical labyrinth and medullary rays of the cortex?
Identify the three general types of tubules that occur in the cortical labyrinth and medullary rays of the cortex:
- proximal tubules (further sub-divided into convoluted and straight portions),
- distal tubules (also divided into convoluted and straight portions), and.
- collecting tubules (or ducts).
What is the medullary pyramid?
fiber bundles in the medulla that appear triangular in cross-section and contain motor fibers, the majority of which are part of the corticospinal tract. These motor fibers decussate at the base of the pyramids in the pyramidal decussation.
What is area Cribrosa?
The apical portion called the papilla, of each renal pyramid projects into a minor calyx. The tip of the papilla is perforated with the openings of 10-25 papillary ducts, the final collecting ducts of the uriniferous tubules, and is therefore called the area cribrosa.
What is the name of the space between the renal pyramids called?
The renal columns are the tissue in between the pyramids. The nephron is the functional unit of the kidney. A region where a portion of the medulla project into the renal cortex are referred to as medullary ray.
What is macula densa?
Macula densa (MD) cells are chief cells within the kidney, playing key sensory and regulatory functions in the maintenance of body fluid, electrolyte homeostasis, and blood pressure.
Are medullary rays in cortex or medulla?
The medullary ray is the middle part of the cortical lobule or renal lobule, consisting of a group of straight tubes to the collecting ducts. Their name is potentially misleading — the “medullary” refers to their destination, not their location. They are located only in the renal cortex, and not in the renal medulla.
What is the main activity difference of PCT and DCT?
Proximal Convoluted Tubule (PCT) receives primary urine from glomerulus. Distal Convoluted Tubule (DCT) receives urine from the glomerulus. PCT regulates excretion of urine by absorbing excess water from primary urine. In DCT, water and salts are secreted.
How can you differentiate between the cortex and medulla on the histology slide?
The cortex consists of convoluted tubules together with the renal corpuscles. The medulla consists of loops of Henle and collecting ducts. The medulla may be divided into “zones” or “stripes”, visible grossly, which reflect the structural differentiation of the tubules that form the loops of Henle.
What is the function of the cortical labyrinth?
What is the cortical labyrinth? The cortical labyrinth contains renal corpuscles and tubules. A central band of cortical labyrinth separates the medullary rays. Each medullary ray with half of the adjacent cortical labyrinth on either side is a lobule.
What is the most abundant tubule in the cortical labyrinth?
These surround the glomeruli, and they are the most abundant tubules of the cortical labyrinth. The cuboidal epithelium of the proximal tubules is strongly acidophilic, in contrast to the lightly stained distal tubules.
What is the difference between medullary ray and cortical labyrinth?
The cortex is subdivided into alternating regions: 1) the cortical labyrinth consists of glomeruli and convoluted tubules; and 2) the medullary rays consist primarily of radially directed straight segments of the loop of Henle and collecting tubules. A kidney lobule consists of a medullary ray and the portions of the adjacent cortical labyrinth.
How do you identify the distal tubules of the Labyrinth?
The cuboidal epithelium of the tubules is palely stained with H&E. The distal tubules are much less numerous than the proximal tubules in the cortical labyrinth. Next, examine the medullary rays adjacent to the labyrinth and the medulla itself. Identify: