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ABSTRACT. Post-embryonic development of Dermatobia hominis (Linnaeus Jr.) (Diplera, Culerebridae) foregul. Foregut in D. hominis (Linnaeus Jr., 1781) as lhe majorily oflhe larval Diplera somalic tissue, is made up ofpolylenic cells, and grows aI the expenses of the polytenizalion of its nuclei followed by the increase in size of each cel!. The oesophagus, 01' ectodermic origem, is interiorly covered by a chilinous squamous epilhelium lhal rests upon a very lhin basallamina. This sheet is surrounded by lhick muscle bundles. The oesophagus inlussuscepts lhe midgul forming lhe cardia. The cardia, with three epithelial layers: lwo internai ones, of eClodennal origin and one exlernal ofendodermic origino At the anterior portion ofthe cm'dia, between these two types of epithelium, there is a clusler of small, non polytenic cells, forming the imaginai disk ofthe foregut. Metamorphosis begins at the end ofthe larval period with signs ofnuclear degeneralion ofali the polylenic cells, as well as the increase in numbel' of lhe imaginai disk ones. The oesophagic pOltion intussuscepled inlo the cardia, everts; ilS cells suffer apoptosis and are replaced by the new cells growing from lhe imaginai disk. The externai layer cells also degenerate and are pinched off into the lumen of lhe very anterior portion of the midgut. The newly formed oesophagus intussuscepts "de novo" to form the two internallayers ofthe adult cardia. At the same time the midgut regenerative cells grow anteriorly to form the new externai layer of lhe adult cardia. KEY WORDS. Diptera, Dermatobia hominis, foregut, cardia, metamorphosis, histology, post-embryonic development A biologia e o ciclo de vida de Dermalobia hominis (Linnaeus Jr., 1781), há muitas décadas vêm sendo descritos (NElVA & GOIvfES 1917;TOLEDO 1948;KOONE & BANEGAS 1959; GUIMARÃEs & PAPÁVERO 1966; BANEGAS el aI. 1967; JOBSEN & MOURIER 1972). Sua morfologia interna vem sendo estudada há alguns anos (GREGÓ-RIO el aI. 1981, 1990a,b, 1992 LELLO el aI. 1984 LELLO el aI. , 1985 LELLO el aI. ,1987. Na fase 1arval, que dura cerca de 30 dias, desenvolve-se como parasita subcutâneo de muitos vertebrados; sendo essa a única fase em que esse inseto se alimenta, torna-se interessante conhecer quais as modificações sofridas pelo tubo digestivo desde esse período até a idade adulta. VIEIRA & LELLO (1996) descrevem o desenvolvimento anatômico do tubo digestivo de D. hominis onde diferenciam três regiões no intestino anterior (IA):faringe, esôfago e cárdia. Nesse trabalho serão analisados os aspectos microscópicos das mudanças anatômicas do esôfago e do cárdia de D. hominis.
ABSTRACT. Post-embryonic development of Dermatobia hominis (Linnaeus Jr.) (Diplera, Culerebridae) foregul. Foregut in D. hominis (Linnaeus Jr., 1781) as lhe majorily oflhe larval Diplera somalic tissue, is made up ofpolylenic cells, and grows aI the expenses of the polytenizalion of its nuclei followed by the increase in size of each cel!. The oesophagus, 01' ectodermic origem, is interiorly covered by a chilinous squamous epilhelium lhal rests upon a very lhin basallamina. This sheet is surrounded by lhick muscle bundles. The oesophagus inlussuscepts lhe midgul forming lhe cardia. The cardia, with three epithelial layers: lwo internai ones, of eClodennal origin and one exlernal ofendodermic origino At the anterior portion ofthe cm'dia, between these two types of epithelium, there is a clusler of small, non polytenic cells, forming the imaginai disk ofthe foregut. Metamorphosis begins at the end ofthe larval period with signs ofnuclear degeneralion ofali the polylenic cells, as well as the increase in numbel' of lhe imaginai disk ones. The oesophagic pOltion intussuscepled inlo the cardia, everts; ilS cells suffer apoptosis and are replaced by the new cells growing from lhe imaginai disk. The externai layer cells also degenerate and are pinched off into the lumen of lhe very anterior portion of the midgut. The newly formed oesophagus intussuscepts "de novo" to form the two internallayers ofthe adult cardia. At the same time the midgut regenerative cells grow anteriorly to form the new externai layer of lhe adult cardia. KEY WORDS. Diptera, Dermatobia hominis, foregut, cardia, metamorphosis, histology, post-embryonic development A biologia e o ciclo de vida de Dermalobia hominis (Linnaeus Jr., 1781), há muitas décadas vêm sendo descritos (NElVA & GOIvfES 1917;TOLEDO 1948;KOONE & BANEGAS 1959; GUIMARÃEs & PAPÁVERO 1966; BANEGAS el aI. 1967; JOBSEN & MOURIER 1972). Sua morfologia interna vem sendo estudada há alguns anos (GREGÓ-RIO el aI. 1981, 1990a,b, 1992 LELLO el aI. 1984 LELLO el aI. , 1985 LELLO el aI. ,1987. Na fase 1arval, que dura cerca de 30 dias, desenvolve-se como parasita subcutâneo de muitos vertebrados; sendo essa a única fase em que esse inseto se alimenta, torna-se interessante conhecer quais as modificações sofridas pelo tubo digestivo desde esse período até a idade adulta. VIEIRA & LELLO (1996) descrevem o desenvolvimento anatômico do tubo digestivo de D. hominis onde diferenciam três regiões no intestino anterior (IA):faringe, esôfago e cárdia. Nesse trabalho serão analisados os aspectos microscópicos das mudanças anatômicas do esôfago e do cárdia de D. hominis.
ABSTRACT. Post-embryonic developrnent of Dermatobia "olllinis (Linnaeus Jr.) (Diptera, Cuterebridae) midgut. Dermatobia "omillis (Linnaeus, 1781) midgul is internally lined by an epithelium 01' polylenic cells, some low others prismatic with well developed brush bordel'. Their apical portion are enlarged by secretOlY vesicles, forming butlon-Iike SlruClures lhal are pinched off lo lhe lumen, some accompained by lhe nucleus characterizing apocrine and holocrine secrelions. This epithelium is gradually renewed by small, non polylenic regenerative cells, found scattered aI ils basal portion. AI lhe end 01' lhe lhird inslar lhe metamorphosis begins. The epithelial cells present signs 01' degeneralion and aI lhe firsl day 01' pupation the regeneralive cells increase in num bel'. By lhe 5 th day 01' pupation these regenerative cells, besides being increased in number, differentiale lhemselves inlo lwo layers: one similar lO lhe dense coneclive tissue that suslainning lhe larva I epithelium is pinched off to lhe midgul lumen forming lhe "yellow bodies"; lhe olheI', develops righl under il as lhe imaginai epilelium. The disorganized muscles bundles 01' lhe midgut wall, are invaded by phagocytes. AI lhe end ofpupalion lhe midgut has a low prismalic epilhelium wilh brush-border. In the adult, the torax portion oI' lhe midgut has prismatic homogeneously basophilic epilhelium while in lhe abdominal portion lhe epithelium is made 01' high prismalic cells full oI' small vacuoles. The larval midgul epilhelium suffers programmed cell dealh non compalible with apoptose. During lhe metamorphosis lhe midgut lenght diminishes from 3 I111m in the larva lo 14111111 in lhe adult. K.EY WüROS. Diplera, Dermatobia hominis, l11idgul, metamorphosis, hislology, posl-embryonic developmenl Trabalhos sobre a morfologia interna do beme são encontrados, em LELLü ef aI. (1984, 1985, 1987); GREGÓRIO et aI. 1981GREGÓRIO et aI. , 1990aGREGÓRIO et aI. ,b, 1992.VIEIRA & LELLO (1996) desecreveram o desenvolvimento anatômico do tubo digestivo de D. hominis e observaram que de maneira geral ele é similar aos de outros dípteros muscóides, não apresentando entretanto, papo e cecos intestinais, em qualquer estágio do desenvolvimento e nem glândulas salivares na fase adulta. O tubo digestivo de D. hominis consta de três porções anatômicas distintas: o intestino anterior, o qual inclui como regiões diferenciadas, a faringe, o esôfago e o cárdia; o intestino médio e o intestino posterior.Este trabalho tem como objetivo mostrar as modificações histológicas do intestino médio (IM) de D. hominis durante o período pós embrionário.
The midgut ultrastucture of the third-instar of Dermatobia hominis (L., Jr.) was investigated using transmission electron microscopy (TEM). The tubular midgut bears a monolayer of epithelial cells with the plasma membrane showing multiple folding where it adjoins the basement membrane. Septate junctions bound the epithelial cells on each side. These cells have electrolucent cytoplasm containing mitochondria, vacuoles, rough and smooth endoplasmic reticula, lamellar bodies, and a prominent nucleus with dispersed chromatin. The peritrophic matrix is close to elongate microvilli, which are sometimes forked. Regenerative cells, in an undifferentiated state when closest to the basement membrane, are scattered throughout the epithelial cells. A thick basement membrane, surrounded by thick connective tissue including muscle, tracheal tubes, and extracellular matrix is linked to epithelial cells by hemidesmosome-like structures. Entero-endocrine, goblet or cuprophilic cells were not observed.
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