Histology and histopathology Vol. 5, nº 3 (1990)

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Browsing Histology and histopathology Vol. 5, nº 3 (1990) by Author "Azanza, M.J."

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    The autonomic innervation of the liver and gallbladder of Podarcis hispanica
    (Murcia : F. Hernández, 1990) Azanza, M.J.; Aisa, J.; Junquera, C.
    The innervation of the liver and gallbladder of the lizard Podarcis hispanica has been studied by the following methods: a) demonstration of cholinesterase activity; b) FIF method for catecholamines; and c) immunohistochemistry for VIP. The hepatic parenchyma of the reptile's liver show hzpatocytes arranged in regular rows of hepatic cords, the portal triad being typical of higher vertebrates (birds and mammals). Nerve fibers are found in the scarce connective tissue distributed among the hepatocytes. The innervation is restricted to the big branches of blood vessels and biliary ducts. It is represented by cholinergic, noradrenergic and VIPergic fibers. The gallbladder shows a well developed cholinergic plexus with pyramidal cells in the interconnection points of the fiber network. The noradrenergic and VIPergic plexuses are also more widely distributed in the gallbladder thali in the liver.
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    Ultrastructural characteristics of anterior gut innervation of Gallus gallus
    (Murcia : F. Hernández, 1990) Aisa, J.; Parra, P.; Azanza, M.J.
    The enteric nervous system of the bird's anterior gut is very well developed. Myelin fibres are seen accompanying the nervous trunks up to the mucous layer. Glial cells duplicate the number of neurons in the myenteric plexuses. Their number decreases at the submucous plexuses, but it is always higher than the neurons. Isolated neurons are widely spread in the circular muscle coat accompanying the nervous trunks which can be inter and intrafascicularly located. Direct synaptic contacts with the soma neurona1 membranes are very often seen. We have never observed synaptic specializations. The most prominent varicosities either in the peripheric nervous trunk axons or directly laying on the soma membranes are those containing peptidergic or mixed vesicles of cholinergic and peptidergic types. The neurons show big nuclei of different size and shape. Neighbouring smooth muscle cells show abundant caveolae near the nervous elements. Although we have not observed close contacts with glands, thin axon bundles spread near the glandular cells of the mucous layer .