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The ultrastructure of fibres and sensory terminals of the aortic nerve innervating the aorta between the left common carotid and left subclavian arteries was investigated in the rat. This is the region from which most baroreceptor responses are recorded electrophysiologically. The fibres of the aortic nerve enter the adventitia and separate into bundles(More)
The three-dimensional branching pattern and ultrastructure of afferent myelinated fibers and their terminals located in the trachealis muscle of the dog are described. The afferent endings are believed to be those of the slowly adapting stretch receptors of the trachea. They have structural features typical of mechanoreceptors: distal to the loss of myelin,(More)
The S neurons of decapod crustacean coxal receptors respond to a constant stimulus with a steady-state response lasting for at least 20 min. This property makes it possible to fix neurons in the stretched or relaxed condition by rotating and pinning the coxa up or down respectively. In specimens perfused with 5 mM lanthanum chloride before fixation, it was(More)
Many neurons in the ganglia of Aplysia californica contain pigmented, membrane-bound granules (lipochondria), which are thought to mediate the light response of some of the neurons, including the giant cell of the abdominal ganglion. A method of isolating the lipochondria by centrifugation of ganglia homogenates has now been developed. Electron microscopy(More)
A set of techniques for localization of unencapsulated sensory receptor terminals in plastic-embedded tissue is described. The tissue is pinned flat in fixative and flat-embedded in a small amount of medium-soft Epon. Pieces of the specimen are remounted so that tangential thick sections (2-3 micron) can be cut. These sections are stained with a mixture of(More)
The relationship between ultrastructure and photosensitivity of pigmented neurons of the abdominal ganglion of Aplysia californica was investigated using electron microscopy and electrophysiological methods. Four identified neurons of similar light microscopic appearance were examined; two are photoresponsive and two are not. Illumination hyperpolarizes(More)
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