XXXX : comparison of ultrastructural features in different phylogenetic groups.

@entity2387 @entity564 @entity3161 @entity11571 @entity7136 @entity9222 @entity16885
The enteric neuromuscular junctions of snail (Helix pomatia), locust ( @entity9222 migratorioides), cockroach ( @entity564 ), @entity7136 ( @entity7136 ) and @entity16885 ( @entity16885 ) were studied by means of different light and electron microscopic methods. The @entity2387 staining revealed that the myenteric plexuses of the above species are composed of nerve cells, a network of varicose nerves and nerve bundles. Instead of highly organized ganglia, single neurons or small groups of 2-4 cells are characteristic of the invertebrates and fish studied. Catecholaminergic fluorescence induced by @entity11571 was detected in the muscular layer of the entire alimentary tract in snail and the hindgut of @entity16885 . Fluorescent nerves and perikarya were frequent in the snail gut, while only nerves and no perikarya were found in @entity16885 . A close contact between enteric muscles and nerves is the most common form of @entity3161 in both the smooth (i.e. the molluscan and fish gut) and the striated (i.e. the insect gut) musculature. The striated musculature (i.e. the insect gut, the oesophagus of @entity7136 , and the oesophagus, stomach and the midgut of @entity16885 ) also receives a synaptic input. Cytochemical evidence is provided of the cholinergic character of fish motor endplates. The ultrastructural appearance and vesicle population of certain nerve terminals suggest a universal role of aminergic and peptidergic control in gut motility.
