tubule

tubule /tu·bule/ (too´būl) a small tube.

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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.

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tu·bule (tbyl)

n.

A very small tube or tubular structure; tubulus.

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Tubule

Tissues and cells associated with the structures that connect the renal pelvis to the glomeruli.

Mentioned in: Wilms' Tumor

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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.

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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.

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tubule

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

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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.