tubule


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tubule

 [too´būl]
a small tube; especially, a minute canal found in various structures or organs of the body. adj., adj tu´bular.
collecting t's the terminal channels of the nephrons, which open on the summits of the renal pyramids in the renal papillae.
convoluted t's channels that follow a tortuous course; there are convoluted renal tubules and convoluted seminiferous tubules.
dentinal t's the tubular structures of the teeth.
galactophorous t's small channels for the passage of milk from the secreting cells in the mammary gland.
Henle's t's the straight ascending and descending portions of a renal tubule forming Henle's loop.
lactiferous t's galactophorous tubules.
mesonephric t's the tubules comprising the mesonephros, or temporary kidney, of amniotes.
metanephric t's the tubules comprising the permanent kidney of amniotes.
renal tubule the minute canals composing the substance of the kidney and secreting, collecting and conducting the urine; in the glomerulus they have a basement membrane and epithelial lining.
seminiferous t's the tubules of the testis, in which spermatozoa develop and through which they leave the gland.
uriniferous t's renal tubules; channels for the passage of urine.

tu·bule

(tū'byūl), [TA]
A small tube.
Synonym(s): tubulus [TA]
[L. tubulus, dim. of tubus, tube]

tubule

/tu·bule/ (too´būl) a small tube.
collecting tubule  one of the terminal channels of the nephrons which open on the summits of the renal pyramids in the renal papillae.
connecting tubule  junctional t.
dental tubules , dentinal tubules dental canaliculi.
distal convoluted tubule  a distal, convoluted part of the ascending limb of the renal tubule, extending from the distal straight tubule to the junctional tubule.
distal straight tubule  part of the renal tubule primarily on the ascending limb, extending from the thin tubule to the distal convoluted tubule.
Henle's tubule  see under loop.
junctional tubule  a short, curved part of the distal end of the renal tubule, extending from the distal convoluted tubule to a collecting duct.
mesonephric tubules  those constituting the mesonephros of the embryo of an amniote.
metanephric tubules  those constituting the metanephros of an amniote.
pronephric tubules  the rudimentary tubules constituting the pronephros of an amniote.
proximal convoluted tubule  the most proximal part of the renal tubule, extending from the glomerular capsule to the proximal straight tubule.
proximal straight tubule  part of the descending limb of the renal tubule, extending from the proximal convoluted tubule to the thin tubule.
renal tubule  the minute reabsorptive canals made up of basement membrane and lined with epithelium, composing the substance of the kidney and secreting, collecting, and conducting the urine; see also nephron.
seminiferous tubules  channels in the testis in which the spermatozoa develop and through which they leave the gland, each comprising a convoluted portion and a straight terminal portion.
T tubules  the transverse intracellular tubules invaginating from the cell membrane and surrounding the myofibrils of the T system of skeletal and cardiac muscle, serving as a pathway for the spread of electrical excitation within a muscle cell.
thin tubule  part of the renal tubule where the walls are especially thin, extending from the proximal straight tubule to the distal straight tubule.
uriniferous tubule  renal t's.

tubule

(to͞o′byo͞ol, tyo͞o′-)
n.
A very small tube or tubular structure.

tubule

[t(y)o̅o̅′byo̅o̅l]
Etymology: L, tubulus
a small tube, such as one of the collecting tubules in the kidneys, the seminiferous tubules of the testes, or Henle's tubules between the distal and proximal convoluted tubules. tubular, adj.

tu·bule

(tū'byūl) [TA]
A small tube.
Synonym(s): tubulus [TA] .
[L. tubulus, dim. of tubus, tube]

tubule

A small tube or tubular structure.

tubule

any small tubular structure; an example is a kidney tubule.

Tubule

Tissues and cells associated with the structures that connect the renal pelvis to the glomeruli.
Mentioned in: Wilms' Tumor

nephron

functional unit of kidney, i.e. Bowman's capsule, proximal convoluted tubule, loop of Henle and distal convoluted tubule
  • collecting tubule straight portion of nephron; lies within renal cortex

  • convoluted tubule portion of nephron immediately distal to Bowman's capsule, made up of descending and ascending limbs of loop of Henle, acting respectively as a selective absorbing membrane and a collecting duct for urine

tu·bule

(tū'byūl) [TA]
A small tube.
[L. tubulus, dim. of tubus, tube]

tubule (too´būl),

n a small tube, such as one of the collecting tubules in the kidneys. The dentin of the tooth contains dentinal tubules that communicate from the pulp to the dentinoenamal interface.

tubule

a small tube; a minute canal found in various structures or organs of the body.

collecting t's
the terminal channels of the nephrons which open on the summits of the renal papillae or renal crests.
convoluted t's
channels which follow a tortuous course. See also renal tubules (below) and tubuli contorti.
dentinal t's
minute channels in the dentine of a tooth that extend from the pulp cavity to the cement or the enamel. Called also dentinal canaliculi.
galactophorous t's
small channels for the passage of milk from the secreting cells in the mammary gland. Called also lactiferous ducts.
Henle's t's
see henle's tubules.
lactiferous t's
see lactiferous ducts.
mesonephric t's
the tubules comprising the mesonephros, or temporary kidney, of amniotes.
metanephric t's
the tubules comprising the permanent kidney of amniotes.
proximal tubule
intrarenal site for the reabsorption of most of the protein in the tubular fluid.
proximal convoluted tubule
the portion of the nephron immediately succeeding the glomerulus; susceptible to disease because of its early exposure to toxins in the glomerular filtrate.
renal t's
the minute canals made up of basement membrane and lined with epithelium, composing the substance of the kidney and secreting, reabsorbing, collecting and conducting the urine. Include proximal convoluted, the nephron loop (containing the proximal straight tubule, descending and ascending thin, and the distal straight tubules) and the distal convoluted tubules.
seminiferous t's
the tubules of the testis, in which spermatozoa develop and through which they leave the gland.
uriniferous t's
renal tubules; channels for the passage of urine.
References in periodicals archive ?
During the current investigation, the histological examination of testis showed no statistically significant difference in the mean diameters of the seminiferous tubules among various groups.
Common procedures used to decrease dentinal hypersensitivity are the use of desensitizing agent that occlude or desensitize tubules.
Selective SGLT-2 inhibitors reduce renal glucose reabsorption by inhibiting SGLT-2 in the kidney, thus reducing the maximum glucose transport capacity in the proximal renal tubule and increasing renal glucose excretion.
Grier and Taylor (1998) created a classification of five classes, such as the ones that were described in this study: regressed (Class I) distribution of abundant spermatogonia cysts in the tubules; early maturation (Class II) beginning of spermatogenesis, cysts in a greater number and sizes; mid maturation (Class III) testis with non-synchronous spermatogenesis, distal tubules with maximum spermatogenic activity and main tubule with greater spermiation; late maturation (Class IV) abundant spermatozoa in the lumen, maximum spermiation activity and reduction of spermatogenesis; regression (Class V) empty tubular lumen and quick regeneration of germinal epithelium.
Whereas seminiferous tubule diameter was lower in hinny than both of the stallion and Jack donkey, which resulted in the mean seminiferous tubule cross-sectional area being lower in the hinny than either in the stallion or Jack donkey.
The objectives of this study was to identify and measure the effect of cypermethrin, at similar concentration observed in areas of high exposure to these agropesticidas, on the morphometry and cellular activity in the seminiferous tubules of the testis of Dugesia gonocephala, an aquatic species from the Chilean Altiplano.
The histological sections of testes were observed under light microscope, and interpreted on the basis of diameter of seminiferous tubules both during breeding and non-breeding seasons, as well as their epithelial cell heights from initial, middle and terminal segments using stage and ocular micrometers.
2 Photomicrographs show a tumour composed of variably sized tubules (a: Hematoxylin and eosin stain [H&E] x100) and cystic spaces (b: H&E x100) that are separated by thin, hypocellular fibrovascular septae (c: H&E x200), with the lining epithelium showing tombstone appearance focally (d: H&E x200); the tubules are lined by atypical cuboidal to pseudostratified ciliated columnar cells (arrow) with abundant eosinophilic cytoplasm (e: H&E x400), large round to ovoid nuclei with prominent nucleoli (f: H&E x400) and hobnail appearance (g: H&E x600); solid areas show smaller tubules lined by similar atypical cells in a sclerotic stroma (h: H&E x200; i: H&E x400).
Mucus coating may also assist the fish in resisting the sticky substances emitted by the Cuvierian tubules (Trott, 1970).
2]), TuL = tubule length (mm), TuW = tubule width (mm), WT = wall thickness (mm), LS = length of septa (mm), Ta5 = number of tabulae in 5 mm TaL TaW TaA TuL Minimum value 1.