| Vasculature of the ophthalmic rete in night herons (Nycticorax nycticorax): scanning electron microscopy of corrosion casts. | |
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MedLine Citation:
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PMID: 12236865 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Vasculature of the ophthalmic rete (rete ophthalmicum) in the night heron (Nycticorax nycticorax) was studied using scanning electron microscopy of vascular corrosion casts and light microscopy on tissue sections. Most blood to the eyeball and a lesser volume of blood to the brain passed through the ophthalmic rete via the external ophthalmic artery. The collateral retial arterioles originated from the external ophthalmic artery forming a flat and fusiform-shaped arterial network at the ventrotemporal region of the eyeball. The arterial network was intermixed with a similar complex of the veins from the eye. The ophthalmotemporal artery, which supplied the eyeball posteriorly, and supraorbital and infraorbital arteries, which supplied the eyeball anteriorly, originated from the rete. Blood from the eye, which is a site of potential heat loss, drained into the ophthalmic rete via the ophthalmotemporal vein. On the casts of retial arterioles, slit-like cleavages at branching sites representing flap valves, which might play a role as sluice valves, were seen. In addition, marks of circularly running grooves, which might represent tufts of smooth muscle cells and might contribute to a sphincter activity, were observed. These anatomical specializations of the avian ophthalmic rete, involving parallel arrangement of arteries and veins, may function to facilitate counter-current heat exchange and to regulate blood pressure and volume to the eye and the brain. |
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Authors:
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Hiroyoshi Ninomiya |
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Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: Veterinary ophthalmology Volume: 5 ISSN: 1463-5216 ISO Abbreviation: Vet Ophthalmol Publication Date: 2002 Sep |
Date Detail:
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Created Date: 2002-09-18 Completed Date: 2002-10-10 Revised Date: 2003-11-14 |
Medline Journal Info:
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Nlm Unique ID: 100887377 Medline TA: Vet Ophthalmol Country: England |
Other Details:
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Languages: eng Pagination: 155-60 Citation Subset: IM |
Affiliation:
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Department of Laboratory Animal Science, Azabu University, 1-17-71 Fuchinobe, Sagamihara 229-8501, Japan. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Animals Animals, Wild Arterioles / physiology Birds / physiology* Corrosion Casting / veterinary Eye / blood supply*, ultrastructure* Microcirculation Microscopy, Electron, Scanning / veterinary Reference Values Regional Blood Flow |
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