title: Micromorphological observations on the nervous elements in the rectal mucosal folds of the rainbow trout (Salmo gairdneri, Rich.).
abstract: Light and ultrastructural characteristics of the nervous elements in the cores of the rectal mucosal folds of the Rainbow trout (Salmo gairdneri, Rich.) are described. The elements comprised occasional nerve cell bodies and many axons, most of the varicosities of which contained large numbers of large granular vesicles (90...120 nm in diameter) and small electronlucent vesicles (40...60 nm in diameter). Very frequent individual relationships between the fibres of the muscularis mucosae and the axon varicosities were noted. These findings are correlated with the functions of this part of the gut and their general significance in teleost gut innervation is discussed.
mesh_terms: D000818:Animals; D001369:Axons / Q000648:ultrastructure; D005260:Female; D007413:Intestinal Mucosa / Q000294:innervation; D008297:Male; D008854:Microscopy, Electron; D009130:Muscle, Smooth / Q000648:ultrastructure; D009474:Neurons / Q000648:ultrastructure; D009940:Organoids / Q000648:ultrastructure; D012007:Rectum / Q000294:innervation; D012487:Salmonidae / Q000033:anatomy & histology*; D014337:Trout / Q000033:anatomy & histology*