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Piercing of the ampulla via the stent-in-stent biliary metal stent technique.
Gastrointest Endosc
February 2015
Division of Digestive Diseases, University of California at Los Angeles School of Medicine, Los Angeles, California, USA.
Vascular regeneration in a basal chordate is due to the presence of immobile, bi-functional cells.
PLoS One
May 2015
Department of Molecular, Cellular, Developmental Biology, University of California Santa Barbara, Santa Barbara, California, United States of America.
The source of tissue turnover during homeostasis or following injury is usually due to proliferation of a small number of resident, lineage-restricted stem cells that have the ability to amplify and differentiate into mature cell types. We are studying vascular regeneration in a chordate model organism, Botryllus schlosseri, and have previously found that following surgical ablation of the extracorporeal vasculature, new tissue will regenerate in a VEGF-dependent process within 48 hrs. Here we use a novel vascular cell lineage tracing methodology to assess regeneration in parabiosed individuals and demonstrate that the source of regenerated vasculature is due to the proliferation of pre-existing vascular resident cells and not a mobile progenitor.
View Article and Find Full Text PDFCyttarocylis ampulla, a polymorphic tintinnid ciliate of the marine plankton.
Protist
January 2014
Monterey Bay Aquarium Research Institute, 7700 Sandholdt Road, Moss Landing, CA 95039, USA.
Tintinnid species are traditionally distinguished via lorica features. Recently, sequencing has revealed polymorphism, i.e.
View Article and Find Full Text PDFDistribution, morphology, and cytology of ampullae of Lorenzini in the Oman shark, Iago omanensis (Triakidae), from the Gulf of Aqaba, Red Sea.
Anat Rec
August 1998
Department of Zoology, Tel-Aviv University, Ramat Aviv, Israel.
Ampullae of Lorenzini are electrosensitive organs that, together with the olfactory organs, form the main sensory systems for foraging and navigation in skates, rays, and sharks. In sharks, these organs are mainly found on the rostral part of the head. This study describes the morphology and cytology of the ampullar system in the Oman shark, Iago omanensis, which is common in the Red Sea.
View Article and Find Full Text PDFMicroangioarchitecture of the guinea pig gallbladder and bile duct as studied by scanning electron microscopy of vascular corrosion casts.
J Anat
August 1992
First Department of Anatomy, University of Vienna, Austria.
The microvasculature of the gallbladder, the common bile duct, and the duodenal papilla was investigated in 20 albino guinea pigs (Cavia porcellus) using microvascular corrosion casting and scanning electron microscopy (SEM). Main supplying and draining vessels (first-order vessels) approach the gallbladder along the cystic duct. From the latter, penetrating vessels (second-order vessels) arise which pierce the muscular coat of the gallbladder body to form the plexus of third-order vessels between the muscle coat and the mucosa.
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