Abstract
Optic nerve ultrastructure was studied in nine humans and 11 monkeys. Unmyelinated nerve fibers, belonging to the peripheral nervous system, lie in the adventitia of the central retinal artery, but all axons of the optic nerve itself are myelinated. The ultrastructure of axons and glial cells is the same as elsewhere in the central nervous system. Astrocyte cell bodies and processes insinuate themselves among the nerve fibers and nerve fiber bundles. An astroglial layer lines all the neuroectodermal surfaces that abut upon connective tissue, such as the pia mater, the adventitia of the central retinal vessels, and the septa. Blood vessels are confined to the connective tissue of the septa and the pia mater. The vessels are mainly capillaries with nonfenestrated endothelium. Adjacent endothelial cells seem to be held together by zonulae occludentes (tight junctions).
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
