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A small tube. SYN: tubulus [TA]. [L. tubulus, dim. of tubus, tube]

- Albarran y Dominguez tubules SYN: Albarran glands, under gland.

- connecting t. a narrow arching t. of the kidney joining the distal convoluted t. and the collecting t..

- convoluted t. of kidney the highly convoluted segments of the nephron in the renal labyrinth comprising the proximal convoluted t., which leads from Bowman capsule to the descending limb of Henle loop, and the distal convoluted t., which leads from the ascending limb of Henle loop to the collecting tube. SYN: Ferrein tube, tubuli contorti (1), tubulus renalis contortus.

- convoluted seminiferous t. SYN: seminiferous tubules.

- dental tubules SYN: canaliculi dentales, under canaliculus.

- dentinal tubules SYN: canaliculi dentales, under canaliculus.

- discharging t. a urinary t. formed by the union of several collecting tubules and terminating as a papillary duct.

- Henle tubules the straight portions of the uriniferous tubules that form the Henle loop, distinguished as the descending and ascending tubules of Henle.

- Kobelt tubules remnants of the mesonephric tubules in the female, contained within the epoöphoron. SYN: wolffian tubules.

- malpighian tubules in insects, slender tubular or hairlike excretory structures that emerge from the alimentary canal between the mesenteron (midgut) and proctodeum (hindgut) in a region frequently termed the pylorus; they vary in number from 1 to over 100, and may be assorted in equally sized bundles in some insects.

- mesonephric t. an excretory t. of the mesonephros. SYN: segmental t..

- metanephric t. an excretory unit of the metanephros or permanent kidney.

- paragenital tubules remnants of embryonic mesonephric tubules, some of which form the paradidymis.

- pronephric t. an excretory unit of the pronephros, present only in vestigial form in human embryos.

- segmental t. SYN: mesonephric t..

- seminiferous tubules one of two or three twisted curved tubules in each lobule of the testis, in which spermatogenesis occurs. SYN: tubuli seminiferi recti [TA], convoluted seminiferous t., tubuli contorti (2).

- Skene tubules the embryonic urethral glands which are the female homolog of the prostate.

- spiral t. the segment of urinary t. coming next after the proximal convoluted t..

- straight t. one of the straight tubules of the kidney, present in the medulla and pars radiata of the cortex.

- straight seminiferous t. straight t. of testis.

- straight t. of testis [TA] the continuation of the tubulus seminifer contortus which becomes straight just before entering the mediastinum to form the rete testis. SYN: tubuli seminiferi recti testi [TA], straight seminiferous t., tubulus rectus.

- T t. SYN: tubulus transversus.

- uriniferous t. the functional unit of the kidney, composed of a long convoluted portion (nephron) and an intrarenal collecting duct.

- wolffian tubules SYN: Kobelt tubules.

tu·bule 't(y)ü-(.)byü(ə)l n a small tube esp a slender elongated anatomical channel

(in anatomy) a small cylindrical hollow structure. See also renal tubule, seminiferous tubule.