Ashley M Carpenter

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An ultrastructural study of 14 round window membranes of seven human ears disclosed three basic layers: an outer epithelium lining the middle ear, a middle core of connective tissue, and an inner epithelium bordering the inner ear. Morphological evidence suggests that these layers participate in absorption and secretion of substances to and from the inner(More)
A round window membrane permeability study of macromolecules in otitis media, using tritiated normal human serum albumin, was done in cats. Eustachian tube obstruction was used to induce otitis media in ten animals. Samples of perilymph in obstructed and normal control ears were studied after 25 minutes of exposure of the round window to tritiated albumin.(More)
Despite the high incidence and prevalence of otitis media, its pathogenesis is not thoroughly understood. In an effort to provide a better understanding of this disease, experimental animal models have been developed which corroborate the changes observed in humans. In this study a new factor was added: tympanic membrane perforation 1 week after Eustachian(More)
A patient with biopsy-proved biliary cirrhosis and previous gastrojejunostomy and portacaval anastomosis experienced episodes of severe hypoglycemia. She was found to have hyperinsulinemia and hyperglucagonemia. An oral glucose tolerance test showed postgastrectomy hypoglycemia. Results of the intravenous tolbutamide test were diagnostic for insulinoma, but(More)
One hundred human and 100 cat temporal bones were studied for the presence of ganglia and/or ganglion cells. These structures were found at the following two main locations: (1) the promontory wall, both anterior to and below the stapes, and (2) the vertical portion of the facial nerve. In the cat, additional ganglion cells were found within the capsule of(More)
An ultrastructural study of eight round-window membranes of four normal cats disclosed three basic layers: an outer epithelium (middle ear), a middle core of connective tissue, and an inner epithelium (inner ear). Morphologic evidence suggests that these layers participate in absorption and secretion of substances to and from the inner ear, such that the(More)
The viability of bone after sagittal splitting of the mandibular ramus by two techniques was studied. Decalcified sections of bone were studied with light microscopy; ground sections of bone labeled with tetracycline were studied with ultraviolet microscopy. The data indicate that avascular necrosis of the proximal fragment occurs after conventional(More)