title: Autoradiographic ultrastructural observation on the meninges of the regenerating tail of lizards.
abstract: The formation of the meninges around the new spinal cord of the regenerating tail of the lizards Anolis and Lampropholis has been studied after injection of 3H-thymidine and 3H-proline. An optical and electron microscopic autoradiographical study revealed that many irregular 3H-thymidine labeled meningeal fibroblasts surround the apical regenerating spinal cord. Meningeal fibroblasts become flat at about 0.5-1 mm from the tail tip while they actively uptake 3H-proline involved in the synthesis of collagen and elastin. Elastic fibres are in intimate contact with the meningeal fibroblasts. One hour after injection of 3H-proline trace grains were seen most in the Golgi apparatus and secretory elastin-like vesicles. The importance of the elastic fibrils around the caudal spinal cord of lizard in relation to the body movements is discussed.
authors.affiliation: Dipartimento di Biologia evoluzionistica e sperimentale, University of Bologna, Italy.
authors.forename: L
authors.initials: L
authors.lastname: Alibardi
mesh_terms: D000818:Animals; D001345:Autoradiography; D002455:Cell Division / Q000502:physiology; D003094:Collagen / Q000648:ultrastructure*; D004548:Elasticity; D005347:Fibroblasts / Q000502:physiology / Q000648:ultrastructure; D008116:Lizards / Q000033:anatomy & histology*; D008578:Meninges / Q000648:ultrastructure*; D009416:Nerve Regeneration / Q000502:physiology*; D013116:Spinal Cord / Q000502:physiology*; D013623:Tail / Q000294:innervation
chemical_list: D003094:Collagen