PMID: 9661294Jul 14, 1998Paper

Ultrastructure of the larval tentacle and its skeletal muscle in Xenopus laevis

Tissue & Cell
W K OvalleP C Nahirney

Abstract

During premetamorphic development, tadpoles of Xenopus laevis possess a transitory pair of long, slender, mobile tentacles situated at the corners of the mouth. Microscopic examination of the larval tentacle typically reveals three distinct compartments: a central core of cartilage, a laterally situated skeletal muscle, and a nerve supply medially. Along the length of each tentacle, the epidermis is supplied by many unmyelinated nerve fibers, presumably sensory in nature, which terminate as naked axons in close association with the epidermal cells. The striated tentacular muscle, in the proximal region of the lateral compartment, consists of extrafusal muscle fibers of varying size which range in number from 36 to 48 per tentacle (n = 10). Using morphometric criteria, we have classified the skeletal muscle fibers of the larval tentacular muscle into three types: large (30-50 microns), intermediate (20-30 microns), and small (10-20 microns). By electron microscopy, each type displays characteristic sarcomeric banding patterns, sarcotubular and mitochondrial disposition, and motor endplate ultrastructure. Our morphological observations indicate that the tentacles of the Xenopus tadpole are complex mobile facial extensions which m...Continue Reading

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Citations

Apr 24, 2009·Journal of Neurophysiology·Kara G Pratt, Carlos D Aizenman
Nov 10, 2017·Journal of Comparative Physiology. A, Neuroethology, Sensory, Neural, and Behavioral Physiology·Sara Hänzi, Hans Straka
Jun 5, 2015·The Journal of Experimental Biology·Sara HänziBoris P Chagnaud

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