RESUMO
The goal of this study was to describe the angioarchitecture of the ventral surface of the tongue from Wistar rats using a vascular corrosion casting technique associated with scanning electron microscopy (SEM). Six Wistar rats were used for the vascular casting method with Mercox resin. Following the resin polymerization, the tongue of each animal was dissected and corroded in a 5% sodium hydroxide solution. Once the corrosion and drying of the specimens were completed, the specimens were mounted on aluminum stubs, coated with carbon and gold and analyzed under SEM. The results showed that the ventral surface of the tongue presents simple, even and abundant vasculature constituted by a vascular plexus consisting of a superficial vascular network and by the ranine veins. The superficial vascular network, made up of the ascending and descending branches, presents as a loose network, with little morphological variation between the capillary loops.
Assuntos
Capilares/ultraestrutura , Língua/irrigação sanguínea , Língua/ultraestrutura , Veias/ultraestrutura , Animais , Molde por Corrosão , Masculino , Microscopia Eletrônica de Varredura/métodos , Ratos , Ratos WistarRESUMO
The placental vasculature of five hystricomorph rodents was examined by latex injection of the blood vessels, immunohistochemistry and scanning electron microscopy of vessel casts. The pattern of branching of the vessels is described at the level of fine structure. The placenta is divided into lobes separated by interlobular trophoblast. Fetal arteries course through the interlobular areas and give rise to capillaries from which blood drains into veins at the centre of the lobes. Maternal blood reaches the placenta through spiral arteries that pass around the perimeter of the subplacenta. They supply large maternal blood sinuses, lined by trophoblast, which run through the interlobular areas and into the centre of the lobes. Here they supply fine channels that run parallel to the fetal capillaries, so that maternal blood flows from the centre of the lobe to the periphery. This arrangement provides the morphological basis for countercurrent exchange. The maternal channels of the labyrinth drain into spaces formed by the latticework of the interlobular trophoblast and thence through venous lacunae to a basal venous lacunar ring. The subplacenta is supplied by a single fetal artery. The vessels within the subplacenta pursue a tortuous course with dilatations and constrictions as in an endocrine gland.
Assuntos
Vasos Sanguíneos/ultraestrutura , Placenta/irrigação sanguínea , Roedores/anatomia & histologia , Animais , Artérias/anatomia & histologia , Artérias/química , Artérias/ultraestrutura , Arteríolas/ultraestrutura , Vasos Sanguíneos/anatomia & histologia , Vasos Sanguíneos/química , Capilares/ultraestrutura , Feminino , Cobaias , Imuno-Histoquímica , Injeções Intra-Arteriais , Injeções Intravenosas , Queratinas/análise , Microscopia Eletrônica de Varredura , Modelos Anatômicos , Neopreno/química , Placenta/anatomia & histologia , Placenta/ultraestrutura , Poliésteres/química , Gravidez , Hidróxido de Sódio/química , Trofoblastos/citologia , Veias/anatomia & histologia , Veias/química , Veias/ultraestrutura , Vênulas/ultraestrutura , Vimentina/análiseRESUMO
El objetivo de esta investigación es estudiar las relaciones de la vena facial con las estructutras adyacentes. Las venas faciales, derecha e izquierda, de 50 cadáveres, fueron disecadas bajo microscopio estereoscopio y descritas sus relaciones con estructuras vecinas. Segmentos de las venas facialesde 10 cadáveres fueron sometidos a cortes histológicos teñidos por el método de weigert modificado por Van Gieson. La vena facial, a pesar de su corto trayecto, sufre importantes variaciones en la constitución de su pared. En sus relaciones de sintopía, se relacionan con músculos, tejido adiposo y glándulas entre otros tejidos. Verificamos la existencia de fibras elásticas y colágenas, conectando la adventicia a los tejidos adyacentes, así como formando una vaina fibrosa alrededor de la vena facial , lo que probablemente protege esta vena de tracciones poroducidas durante los movimientos de las estructuras vecinas. En el trabajo también son discutidas las implicancias de la sintopía de la vena facial y de los requerimientos biodinámicos generados por el movimiento sobre la morfología de esta vena
Assuntos
Humanos , Masculino , Adulto , Face/irrigação sanguínea , Veias/ultraestrutura , Colágeno , Tecido Elástico/anatomia & histologiaRESUMO
A arterializaçäo da veia cefálica como via de acesso para hemodiálise foi estudada em 142 pacientes em tratamento. O estudo ultra-estrutural da veia implantada na artéria mostrou que: 1. A veia quando submetida ao regime de pressäo arterial aumenta progressivamente suas dimensöes; 2. A veia inicialmente tem parede fina, túrgida e é pulsátil; progressivamente vai se espessando, empalidecendo e os vasos da camada adventícia tornam-se nitidamente visíveis; 3. A parede venosa apresenta histologicamente roturas de suas estruturas e proliferaçäo fibrosa em todas as túnicas; 4. A evoluçäo ultra-estrutural da veia sob pressäo arterial, produz inicialmente espessamento da membrana citoplasmática, vacuolizaçäo das células musculares lisas e fragmentaçäo das fibras elásticas com invasäo de fibroblasto; 5. A degeneraçäo levando ao desarranjo ultra-estrutural da veia, enfraquecendo sua parede pela rotura das fibras elásticas, pode levar a complicaçöes como dilataçöes saculares aneurismáticas; 6. O exame macroscópico tardio mostra espessamentos irregulares da parede do vaso equivalentes ao da arteriosclerose; 7. A adaptaçäo da veia à condiçäo de pressäo arterial pode ser denominada de arterializaçäo, uma vez que seu arranjo histológico e ultra-estrutural desenvolve formaçöes de reforço que, macroscopicamente, lembram a artéria e estäo sujeitas à degeneraçäo, equivalente ao que nela ocorre e que evolui para a arteriosclerose
Assuntos
Humanos , Masculino , Braço/irrigação sanguínea , Pressão Arterial , Veias/ultraestruturaRESUMO
Cast of the mucosal and submucosal veins of the esophago-gastric junction were studied in five necropsy specimens by scanning electron microscopy to analyse some of the characteristics of their shape and surface. Two types of veins were described: 1) veins with circumscript, fusiform and/or ampullar bulges and relatively smooth surfaces; 2) veins with numerous, small bulges and blister-shaped micro-dilatations. The role of these features is considered in the formation of esophageal varices.
Assuntos
Junção Esofagogástrica/irrigação sanguínea , Adulto , Feminino , Humanos , Masculino , Microscopia Eletrônica de Varredura , Veias/ultraestruturaRESUMO
In this study we evaluated the histologic condition, prostacyclin production, and compliance of morphologically intact cryopreserved venous homografts (CVH) and autografts 3, 6, and 9 months after arterial implantation. Eighteen external jugular veins were cryopreserved and implanted into the carotid arteries of mongrel dogs. All grafts were patent at the time of excision. Electron microscopy documented a disrupted endothelium in the homografts at 3 months that was intact at 9 months. The cellular infiltrate, suggestive of rejection, in the 3-month homografts resolved by 9 months. Prostacyclin production at 3 months was 8.7 +/- 3.2 pg/ml/cm2 compared with 24.1 +/- 9.6 pg/ml/cm2 (p less than 0.025) in the adjacent carotid artery. The prostacyclin production in the 6-month homografts was 21.7 +/- 12.4 pg/ml/cm2, not significantly different from the adjacent carotid artery. The return of prostacyclin paralleled the return of an intact endothelium. Compliance of fresh vein was diminished by cryopreservation, from 1.57 +/- 0.39% radial change/mm Hg (10(-2] to 0.79 +/- 0.21% radial change/mg Hg (10(-2] (p less than 0.02). The compliance of CVH at 3 months (1.7 +/- 1.0) and at 6 months (1.1 +/- 0.42) was not significantly different from cryopreserved veins. These data showed that CVH remained patent in dogs for 9 months, without loss of compliance for 6 months, and developed a morphologically intact and functional endothelium that paralleled the resolution of the inflammatory infiltrate.
Assuntos
Artérias Carótidas , Criopreservação , Veias/transplante , Animais , Complacência (Medida de Distensibilidade) , Cães , Endotélio Vascular/citologia , Epoprostenol/biossíntese , Microscopia Eletrônica , Fatores de Tempo , Transplante Autólogo , Transplante Homólogo , Veias/metabolismo , Veias/ultraestruturaRESUMO
A case of intravascular leiomiomatosis is presented. This gynecologic diseases is rare, although it can be of risk. A case is described with a review of the literature.