Ηλεκτρονική μικροσκοπία της ανθρώπινης επίφυσης (κωναρίου): Συγκριτική μελέτη στις διάφορες ηλικίες

With the exception of one study of embryonic tissue, there is no reference in the literature concerning the ultrastructure of human pineal. In this work we present the results of a study of 24 human pineals from individuals aged 4-75 years. The material was obtained from autopsies which were performed 45-240 minutes following death. The main cellular element of the human pineal is the pineocyte but glial cells as well as nerve fibers were also identified. Tight junctions were identified between the capillary endothelial cells. The ultrastructure of the human pineocyte is similar to that of the pineocytes of other mammalian species. In particular we proved the presence of some organelles which are unique to the pineal (e.g. synaptic spherules, microtubular sheaves) or characteristic for the pineocyte and a few other cell types (e.g. synaptic ribbons). These organelles were not described in the human embryonic pineal. The function of microtubular sheaves is not known but it is believed that they are derived from centrioles. Our results support this view. Synaptic spherules have been described in only a few other mammalian species (e.g. guinea pig, rabbit). Our study indicates that these organelles are more often encountered in the human pineocyte than the synaptic ribbons. Their function and relation to the synaptic ribbons is disputed but they are generally believed to be distinct from the latter and to be involved in the secretory function of the pineal. Our study supports both these views. Synaptic ribbons were similar to those described in other mammalian and submammalian species.

Grantor dc:publisher

University of Patras

Year dc:date

1990

Authors dc:creator

• Petrou, Georgios
• Πέτρου, Γεώργιος

• Εγκεφαλική επίφυση
• Επιφυσιοκύτταρο
• Ηλεκτρονική μικροσκοπίας της ανθρώπινης επίφυσης
• Κωνάριο
• Μικροσωληνώδη δεμάτια
• Συναπτικά σφαιρίδια
• Συναπτικές ταινίες
• Epiphysis cerebri
• Human pineal gland
• Microtubular sheaves
• Pineocyte
• Synaptic ribbons
• Synaptic spherules
• Ultrastructure of the human pineal gland
• Ιατρική και Επιστήμες Υγείας
• Βασική Ιατρική
• Medical and Health Sciences
• Basic Medicine

Language dc:language

gre

Identifier

10.12681/eadd/1393

OAI identifier oai:identifier

oai:10442/1393