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Topic: Seminiferous tubule

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	Sertoli cell - Wikipedia, the free encyclopedia
		Transverse section of a tubule of the testis of a rat.
		A Sertoli cell (a kind of sustentacular cell) is a 'nurse' cell of the testes which is part of a seminiferous tubule.
		The junctions of Sertoli cells form the blood-testis barrier, a structure that partitions the interstitial blood compartment of the testis from the adluminal compartment of the seminiferous tubules.
	en.wikipedia.org /wiki/Sertoli_cell (458 words)

	MALE REPRODUCTIVE SYSTEM (Site not responding. Last check: 2007-10-31)
		The wall of the seminiferous tubule (a) is composed of myoid cells, fibroblasts, and fibromuscular connective tissue.
		The stratified seminiferous epithelium is separated from the wall by a basal membrane.
		Spermatogonia (b) and Sertoli cells (arrow) lie on the basal membrane, and are in the basal compartment.
	kobiljak.msu.edu /CAI/Histology/Hist15_01.htm (82 words)

	Reproductive Biology and Endocrinology \| Full text \| Understanding spermatogenesis is a prerequisite for treatment
		(A) Sector of the germinal epithelium in the seminiferous tubule
		The seminiferous tubule consists of the germinal epithelium and the peritubular tissue (lamina propria)(Fig.
		As a result of the complex cooperation of intermediate filaments and cytoplasmic tubules of the Sertoli cells spermatids are advanced to the border of the lumen of the seminiferous tubule [5].
	www.rbej.com /content/1/1/107 (4758 words)

	Altweb: Mechanisms of Toxicity
		After waiting 16 - 24 hours for seminiferous tubule fluid to accumulate, the animal is killed, and the testes are removed and weighed; the increased weight of the ligated testis compared to the unligated testis reflects the accumulation of seminiferous tubule fluid.
		Using the lumenal oil droplet method, a statistically significant decrease in seminiferous tubule fluid secretion was observed after 3 weeks of 2,5-hexanedione exposure while 4 weeks of exposure was required before a decrease was observed by efferent duct ligation.
		Exposure to microtubule disrupters which are known testicular toxicants consistently results in decreased seminiferous tubule fluid secretion and germ cell loss, indicating that Sertoli cell microtubules are critical to normal testicular homeostasis.
	altweb.jhsph.edu /meetings/toxicity/boekelheide.htm (794 words)

	The Testes
		The stratified epithelium of the tubule is composed of seminiferous tubules and the spermatogenic cells.
		Spermatozoa are found near the lumen of the seminiferous tubules with their heads embedded in the cytoplasm of the Sertoli cells.
		The green arrow is pointing to the length of the epithelium of the seminiferous tubule where the spermiogenic cells are located.
	www3.umdnj.edu /histsweb/lab16/lab16testis.html (850 words)

	Seminiferous tubules - Wikipedia, the free encyclopedia
		(Semeniferous tubules visible in center, but not labeled.)
		Seminiferous tubules are located in the testicles, and are the specific location of meiosis, and the subsequent creation of gametes, namely sperm.
		The epithelium of the tubule consists of sustentacular or Sertoli cells, which are tall, columnar type cells that line the tubule.
	en.wikipedia.org /wiki/Seminiferous_tubule (111 words)

	low testosterone, menopause relief, infertility treatment
		Spermatogonia, spermatocytes and spermatids of 40 cross-sections through the seminiferous tubules were counted for each animal from both experimental and control groups (a total of 640), with identical diameter of the tubules (determined by eyepiece micrometer) in phase VII, according to the classification of Leblond and Clermon (1952).
		Using light microscopy, the thickening of the layer of the spermatogenesis cells was observed in the cross-sections of the seminiferous tubules and a narrowing of their lumen in the treated animals.
		The number of spermatogonia in one seminiferous tubule in the control animals was 36 (between 36 and 40 spermatogonia per tubule).
	www.bpg.bg /tribestan/clinical/5_2_pharmacology.html (2594 words)

	M5~
		Looking at the seminiferous tubules, this stain nicely shows the thin basement membrane upon which the basal layer of germ cells rests.
		Secondary spermatocytes are located near the lumen of the seminiferous tubule and are about one-half the diameter of primary spermatocytes.
		Figure 104: Schematic depiction of the seminiferous tubule with its surrounding tissue.
	www.mc.vanderbilt.edu /histology/labmanual2002/labsection3/TestesandSperm03.htm (1312 words)

	MALE REPRODUCTIVE SYSTEM
		Primate seminiferous epithelium is a mosaic of different associations of stages of germ cells, each occupying a small area of seminiferous tubule.
		The "wall" (boundary tissue) of a seminiferous tubule includes not only the basal lamina of the epithelium (hard to distinguish here) but also collagen fibers and several layers of somewhat elongated cells, the myoid cells (myoid cells are contractile and can also be seen on slide b-31).
		In addition to the testis seminiferous tubules, this section contains the caput (head) of the epididymis including both the efferent ductules and the caput of the ductus epididymis.
	medocs.ucdavis.edu /CHA/402/labsyl/01/16.htm (2346 words)

	Testis, Monkey (Site not responding. Last check: 2007-10-31)
		They are located outside the seminiferous tubules and their function is secretion of testosterone.
		Within the seminiferous tubules are two cell types: 1) supporting cells called Sertoli or sustentacular cells, and 2) spermatogenic cells.
		Even in a thick section, few of the sustentacular cells in a section of the seminiferous tubule would be cut through the nucleus, and so they are in effect invisible.
	www.austincc.edu /histologyhelp/organs/oy_testis.html (366 words)

	Male Reproductive System
		Focus your study on one tubule and identify the cells (essentially the nuclei) of the epithelia.
		Emptying into these canals are the straight tubules (tubuli recti) of the seminiferous tubules that may not be apparent in your section.
		The tubuli recti are lined with Sertoli cells and connect the seminiferous tubule to the rete testis.
	anatomy.iupui.edu /courses/histo_D502/D502f03/f03_labs/Lab17/Lab.17.male.repro.f03.html (2017 words)

	ILO SafeWork - Gender issues - Articles from the Encyclopaedia
		Sperm leaving the seminiferous tubules are immature: unable to fertilize an ovum and unable to swim.
		Spermatozoa released into the lumen of the seminiferous tubule are suspended in fluid produced primarily by the Sertoli cells.
		ABP is secreted primarily into the seminiferous tubular fluid and is transported to the proximal portion of the caput epididymis, possibly serving as a local carrier of androgens (Bardin 1986).
	www.ilo.org /public/english/protection/safework/gender/encyclo/rep03ae.htm (2849 words)

	rep5
		These tubules are lined by Sertoli cells, which sustain, protect, and nourish the developing sperm under the regulation of follicle stimulating hormone (FSH).
		Between the seminiferous tubules are the interstitial cells of Leydig.
		The compartment close to the lumen contains spermatocytes, round spermatids, and spermatozoa, which are bounded by junctional complexes and the lumen of the seminiferous tubule.
	www.vet.purdue.edu /bms/nour/production/Physiology/reproductive/rep5.htm (367 words)

	Laboratory Twenty-One: Male Reproductive
		Recognize the various cell types of the seminiferous tubule and of the interstitium of the testis.
		The junction of the seminiferous tubule with the tubuli recti (straight tubules) may be seen in certain favorable sections.
		Describe the arrangement of seminiferous tubules and the rete testis within the connective tissue elements of the testis.
	medinfo.ufl.edu /year1/histo/review/lab21.html (1388 words)

	Endotext.com - Endocrinology Of Male Reproduction, Endocrinology of the Male Reproductive System
		External to the basement membrane of the seminiferous tubule, there are several layers of modified myofibroblastic cells termed myoid cells(46,47).
		These cellular layers are responsible for the irregular contractions of the seminiferous tubules which propel fluid secreted by the Sertoli cells, together with testicular spermatids into the lumen and through the tubular network to the region of the rete testis.
		The data indicate that the metabolic activity of the Sertoli cell is influenced by the populations of germ cells that are found at a particular stage of the seminiferous cycle (69-71).
	www.endotext.org /male/male1/male1_2.htm (7209 words)

	Blue Histology - Male Reproductive System
		Interstitial tissue between the convoluted tubules is continuous with a layer of loose vascular connective tissue, the tunica vasculosa testis, which is found beneath the tunica albuginea.
		Sertoli cells extend from the basement membrane to the luminal surface of the seminiferous epithelium.
		Find a nice seminiferous tubule and identify smooth muscle cells that surround the tubule, spermatogonia (it is difficult to distinguish between A and B spermatogonia), primary spermatocytes and spermatids.
	www.lab.anhb.uwa.edu.au /mb140/CorePages/MaleRepro/malerepro.htm (2750 words)

	Reproductive System / Male Reproductive System / Testes
		A transverse section of a seminiferous tubule shows that it is packed with cells in various stages of development.
		Each successive stage in spermatogenesis is pushed toward the center of the tubule so that the more immature cells are at the periphery and the more differentiated cells are nearer the center.
		The sperm are released into the lumen of the seminiferous tubule and leave the testes.
	training.seer.cancer.gov /module_anatomy/unit12_2_repdt_male1_testes.html (849 words)

	Male Reproduction System
		The epithelium of the seminiferous tubules is an indistinct stratified cuboidal, and is composed of the gametogenic cells in various stages of development.
		Between the seminiferous tubules is a loose connective tissue.
		Fifteen to twenty tubules, the ductuli efferenti link the rete testis with the epididymis, a long (4-6 m) coiled tube that lies on the posterior surface of the testis.
	courseweb.edteched.uottawa.ca /medicine-histology/English/Reproduction/Male/malerepro.htm (3603 words)

	Testis Morphometry, Seminiferous Epithelium Cycle Length, and Daily Sperm Production in Domestic Cats (Felis catus) -- ...
		of the cycle of the seminiferous epithelium [9].
		by seminiferous tubules in the testis and the tubular diameter,
		Seminiferous epithelium cycle and its duration in capybaras (Hydrochoerus hydrochaeris).
	www.biolreprod.org /cgi/content/full/68/5/1554 (5359 words)

	Function of Stem Cell Factor as a Survival Factor of Spermatogonia and Localization of Messenger Ribonucleic Acid in ...
		Autoradiography of the seminiferous tubules from stage XII of the seminiferous epithelial cycle cultured for 72 h in the absence (A) and presence (B) of recombinant human SCF (100 ng/ml).
		The tubule segments from stage XII of the cycle proceed to stage I of the cycle during the culture.
		C, Quantification of the labeled cells in the 2-mm tubule segment from stage XII cultured for 72 h in the absence and presence of SCF (100 ng/ml).
	endo.endojournals.org /cgi/content/full/140/3/1492 (4388 words)

	Cyclic Expression of Endothelin-converting Enzyme-1 Mediates the Functional Regulation of Seminiferous Tubule ...
		framework of the seminiferous tubules and the milieu for germ
		Seminiferous tubule contractility is fundamental for sperm progression towards the rete testis and its regulation represents,
		Contractility of seminiferous tubules as related to sperm transport in the male.
	www.jcb.org /cgi/content/full/145/5/1027 (5970 words)

	Medical Dictionary: Seminiferous tubule - WrongDiagnosis.com
		Seminiferous tubule: any of the numerous long convoluted tubules in the testis which are the sites where spermatozoa mature
		Seminiferous tubule : The convoluted tubules in the TESTIS where sperm are produced (SPERMATOGENESIS) and conveyed to the RETE TESTIS.
		Spermatogenic tubules are composed of developing germ cells and the supporting SERTOLI CELLS.
	www.wrongdiagnosis.com /medical/seminiferous_tubule.htm (218 words)

	Spermatogenic Cycle Length and Spermatogenic Efficiency in the Gerbil (Meriones unguiculatus) -- Segatelli et al. 25 ...
		The tubular diameter of the seminiferous tubule and the
		Berndtson WE, Desjardins C. The cycle of the seminiferous epithelium and spermatogenesis in the bovine testis.
		Frequency of the stages in the cycle of the seminiferous epithelium in the rat.
	www.andrologyjournal.org /cgi/content/full/25/6/872 (4769 words)

	Digital Atlas of Fathead Minnow Histology: REPRODUCTIVE SYSTEM - MALE (Site not responding. Last check: 2007-10-31)
		Each lobe is comprised of a longitudinally oriented collecting duct (ductus deferens) along the length of which radiate seminiferous tubules (Fig.
		The thin capsular walls of these tubules are formed by invagination of the tunica albuginea.
		Spermatogenesis is said to be unrestricted in fathead minnows meaning that maturation of sperm occurs along the entire length of the seminiferous tubules (Grier, 1981).
	aquaticpath.umd.edu /fhm/male.html (378 words)

	NEL, Quantitative study on the effects of chronic ethanol administration on the testis pii:NEL220201A03
		RESULTS: The 3H-thymidine autoradigraphic investigation revealed that there was a significant inhibition in the proliferative activity of the spermatogonia in all stages of the seminiferous tubule cycle in the alcohol-treated rats versus controls as indicated by the values of 3H-labelling indices.
		The histological and numerical investigations indicated that the alcohol-treated rats presented testicular lesions including a significant decrease in the diameter of the seminiferous tubules, the number of different germ cells in all stages of the seminiferous tubule cycle and the presence of degenerative germ cells.
		These effects may be due to the effect of alcohol on the gonadotrophic cells of the pituitary gland and/or directly on the seminiferous tubules and Leydig cells.
	www.nel.edu /22_2/NEL220201A03_El-Sokkary.htm (278 words)

	Cardiovascular and Defense
		The preservation of the seminiferous tubules is not all that great so you will not get the impression of the different stages of spermatogenesis.
		Associated with the testis is a region of tubules with relatively uniform height epithelium with hair-like projections.
		The epithelial preservation of the seminiferous tubules is not good so do not bother to try identifying cell types.
	www.fsu.edu /~histo/for~1.htm (2597 words)

	[No title]
		22 [0-0]: [12-1]: H & E- In the adult male spermatozoa are produced within seminiferous tubules of the testis (a), which empty into cavities of the rete testis (b) continuous with the ductuli efferentes (d) which in turn are continuous with the ductus epididymidis (c).
		[12-7]: H & E- Between the seminiferous tubules occur clusters of Leydig (interstitial) cells which tend to stain darkly with eosin and exhibit round nuclei.
		Answer- Testosterone [12-8]: TEM 18-3 In this section of a seminiferous tubule containing spermatogonia (3) the basement membrane (1) occurs adjacent to a peritubular myoid cell (2).
	www.georgetown.edu /dml/educ/hist/lab12/lab12.txt (639 words)

	Ligand-Dependent Regulation of Retinoic Acid Receptor {alpha} in Rat Testis: In Vivo Response to Depletion and ...
		The frequency of seminiferous tubules exhibiting silver grains in their basal aspect was determined in testes from both normal adult rats and rats on a VAD diet for 6 weeks.
		The frequency of tubules for normal adult was arbitrarily set equal to 1 and the relative number of tubules from rats on a diet for 6 weeks was calculated.
		The number of silver grains per unit area of seminiferous tubule from the testes of VAD rats and rats 2, 4, 12, and 24 h after retinol injection were determined.
	endo.endojournals.org /cgi/content/full/139/3/1239 (5389 words)

	LM of human seminiferous tubule (Site not responding. Last check: 2007-10-31)
		LM of a seminiferous tubule in human testis
		This seminiferous tubule, seen in a conventional paraffin section of human testis, shows germ cells in various phases of development.
		Clusters of Leydig cells occur in the adjacent interstitial tissue.
	www-personal.umich.edu /~akc/Bibliography/humanST.htm (38 words)

	The Mammalian Testis (Site not responding. Last check: 2007-10-31)
		This is a section through the testis showing numerous seminiferous tubules.
		The tails of mature sperm can be seen protruding into the lumen of the upper seminiferous tubule.
		Note the differences in cell morphology from the external (peripheral) edge of the tubule toward the internal (lumenal) edge.
	www.uoguelph.ca /zoology/devobio/210labs/testes1.html (87 words)

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