Is papillary duct the same as collecting duct?
Is papillary duct the same as collecting duct?
Papillary duct Papillary (collecting) ducts are anatomical structures of the kidneys, previously known as the ducts of Bellini. Papillary ducts represent the most distal portion of the collecting duct. They receive renal filtrate (precursor to urine) from several medullary collecting ducts and empty into a minor calyx.
What cell types are located in the epithelial lining of the late DCT and collecting ducts?
The epithelium of these tubules consist of cuboidal or columnar cells. They empty into collecting ducts that are easy to recognise, because they have large lumens, with pale staining columnar epithelium.
What are principal cells and intercalated cells?
Principal cells are the main Na+ reabsorbing cells and the site of action of aldosterone, K+-sparing diuretics, and spironolactone. Type A intercalated cells mediate acid secretion and bicarbonate reabsorption. Type B intercalated cells mediate bicarbonate secretion and acid reabsorption.
What type of tissue is the collecting duct?
simple cuboidal epithelium
The collecting duct is composed of simple cuboidal epithelium. There are two distinct cell types present in the collecting tubules: intercalated cells and principal cells.
What two cell types are found in the collecting duct?
The collecting ducts are composed of two cell types: principal and intercalated cells. Principal or light cells are the most numerous and are characterized by a pale cytoplasm with sparse organelles. Principal cells increase in size from the cortex to the medulla and are largest in the papillary ducts.
What is collected in the collecting duct?
The last part of a long, twisting tube that collects urine from the nephrons (cellular structures in the kidney that filter blood and form urine) and moves it into the renal pelvis and ureters.
Where are collecting ducts located?
The collecting ducts extend from the connecting segment in the cortex through the outer and the inner medulla to the tip of the papilla, and can arbitrarily be subdivided into three regions based on their location in the kidney.
What type of epithelium is found lining the renal tubules and collecting ducts?
Collecting ducts are readily recognized in the renal medulla, as relatively large tubules lined by cuboidal epithelium, in which the epithelial cells are relatively clear (i.e., not as eosinophilic as proximal and distal tubules) and have distinct cell borders.
What is intercalated cells in the collecting duct?
Intercalated cells are epithelial cells traditionally associated with the regulation of acid-base homeostasis in distal segments of the kidney tubule (Figure 1) (1). These cells also participate in potassium and ammonia transport and have a role in the innate immune system.
What is secreted in the collecting duct?
The alpha-intercalated cell of collecting duct is the main responsible for hydrogen secretion into the urine. The carbon dioxide, which is generated in the cells and enters from the blood, is changed to carbonic acid. This carbonic acid is divided into hydrogen ion and bicarbonate ion.
Where is the papillary duct?
renal pelvis
The papillary ducts open at the tip of renal papilla into the renal pelvis. The renal pelvis is lined by transitional cell epithelium and its continuation forms the ureter. The mouse renal papilla may be very long and protrude into the initial portion of the ureter.
What are the predominant cell types found in the collecting duct?
The two main cell types of the cortical collecting duct are principal cells and intercalated cells.
What are the two main cell types of the cortical collecting duct?
The two main cell types of the cortical collecting duct are principal cells and intercalated cells. Principal cells are paler than intercalated cells, a difference that is best seen on toluidine blue-stained sections.
What is the difference between collecting duct and medullary duct?
The collecting ducts (see Fig. 1.13) may be subdivided into cortical and medullary ducts, and the medullary ducts into outer and inner; the transitions are gradual. Like the CNT, the collecting ducts are lined by two types of cell: CD cells (principal cells) and IC cells.
What is the collecting duct made of?
The collecting ducts span the renal cortex and medulla and concentrate the urine. The collecting duct is composed of simple cuboidal epithelium. There are two distinct cell types present in the collecting tubules: intercalated cells and principal cells.
What type of epithelium is found in the collecting duct system?
The epithelium is composed primarily of principal cells and α-intercalated cells. The simple columnar epithelium of the collecting duct system transitions into urothelium near the junction of a papillary duct and a minor calyx.
