Michele Miller Bever

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The three-dimensional morphology of the membranous labyrinth of Xenopus laevis is presented from embryonic through late tadpole development (stages 28 to 52, inclusive). This was accomplished by paint-filling the endolymphatic spaces of Xenopus ears at a series of stages, beginning with the embryonic otic vesicle and ending with the complex ear of the late(More)
Morphogenesis of the inner ear is a complex process in which the balance of cell division and death is presumed to play an important role. Surprisingly, there are no reports of a systematic comparison of these two processes in individual ears at different stages of development. This study presents such an analysis for the chicken otocyst at stages 13-29(More)
This report provides a description of the normal developing inner ear of the zebrafish, Danio rerio, with special focus on the pars inferior. Zebrafish specimens, ranging in age from 3 to 30 days postfertilization (dpf), were processed for standard histologic sections or with a paint-fill method to show three-dimensional morphogenesis of the membranous(More)
We present the normal patterns of programmed cell death in the developing inner ears of a primitive anuran, Xenopus laevis, and an ostariophysan fish, Danio rerio. A prominent ventromedial focus of cell death was described previously in the developing chicken and mouse otocysts. We hypothesize that this focus of cell death might be associated with a(More)
Mystery snails (Family Ampullariidae) are aquatic prosobranchs which possess structurally complex eyes at the tip of a cephalic eyestalk. No other sensory organs are found in association with this stalk. These snails possess the ability to regenerate the eye completely after amputation through the mid-eyestalk. Amputation induces gross changes in the(More)
The influence of the target tissue on afferent nerve regeneration was studied in the adult glass catfish, Kryptopterus. In this fish, electroreceptors in the anal fin are distributed in a characteristic pattern in the proximal part of the fin and are absent in the distal portion of the fin. We tested whether axons were more likely to induce electroreceptors(More)
The regeneration of ampullary electroreceptors was studied in the living catfish, Kryptopterus, by differential interference contrast optics. Electroreceptors in this transparent catfish are found, among other places, along the proximal portion of each anal fin ray, while the distal portion does not contain electroreceptors. Upon interruption of the sensory(More)
Immediately following amputation through the eyestalk of the mystery snail (Pomacea), a persistent ionic current enters the apical amputation surface of the eyestalk stump. The circuit is completed by current driven from undamaged integument of the eyestalk stump and other body regions. The current is relatively steady during the first 10 hours following(More)
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