title: [Existence of cholinergic receptors in the very young chick embryo].
abstract: The injection of certain cholinergic agents in the yolk sac of young Chick embryos (40 to 48 hrs. of incubation) gives rise to a twisting of the cervical notochord and spinal cord and contraction of the cervical somites. These morphogenetic changes result in spinal column malformations in older embryos. The effects of the cholinergic agents are inhibited by simultaneous treatments with a cholinergic agonist and an antagonist or a cholinergic receptor ligand. The results lead to the assumption that the early embryos already possess cholinergic receptors, probably located in the notochord.
mesh_terms: D000818:Animals; D002642:Chick Embryo; D009420:Nervous System / Q000196:embryology*; D009421:Nervous System Malformations; D009538:Nicotine / Q000031:analogs & derivatives / Q000494:pharmacology; D010276:Parasympatholytics / Q000494:pharmacology; D010277:Parasympathomimetics / Q000494:pharmacology*; D011950:Receptors, Cholinergic / Q000187:drug effects*; D011978:Receptors, Nicotinic / Q000187:drug effects; D013116:Spinal Cord / Q000002:abnormalities / Q000196:embryology*; D013329:Structure-Activity Relationship
chemical_list: D010276:Parasympatholytics; D010277:Parasympathomimetics; D011950:Receptors, Cholinergic; D011978:Receptors, Nicotinic; D009538:Nicotine
vernacular_title: Sur l'existence de récepteurs cholinergiques chez le très jeune embryon de poulet