Anterior Segment Growth and Peripheral Neural Pathways in Chick

Autor:	Ton Lin, Reiko Sugimoto, Klara Pendrak, Cheryl Capehart, Richard A. Stone
Rok vydání:	2006
Předmět:	genetic structures medicine.medical_treatment Dark Adaptation Ophthalmic Nerve Biology Cornea Cellular and Molecular Neuroscience Ciliary body Anterior Eye Segment Neck Muscles Neural Pathways medicine Animals Peripheral Nerves Ganglionectomy Ultrasonography Denervation Ciliary Body Anatomy eye diseases Sensory Systems Ophthalmic nerve Peripheral Ophthalmology medicine.anatomical_structure Animals Newborn Trigeminal Ganglion PHOTOKERATOSCOPE sense organs Chickens
Zdroj:	Current Eye Research. 31:511-517
ISSN:	1460-2202 0271-3683
DOI:	10.1080/02713680600738127
Popis:	To learn if peripheral nerve pathways are necessary for corneal expansion and anterior segment growth under a 12-hr light:dark cycle or for the inhibition of corneal expansion under constant light rearing.Recently hatched White Leghorn chicks under anesthesia received unilateral ciliary ganglionectomy (CGx), cranial cervical ganglionectomy (Sx), or section of the ophthalmic nerve (TGx), along with sham-operated and/or never-operated control cohorts. Chicks were reared postoperatively under either a 12-hr light:dark cycle or under constant light. After 2 weeks and with the chicks under anesthesia, corneal radii of curvature and diameters were obtained with a photokeratoscope, refractometry and A-scan ultrasonography were performed, and the axial and equatorial dimensions of enucleated eyes were measured with digital calipers. Corneal areas were calculated from corneal curvatures and diameters.Despite the rich peripheral innervation to the eye, the selective denervations performed here exerted remarkably limited effects on corneal expansion and anterior segment development in chicks reared under either lighting condition. Ophthalmic nerve section did reverse in large part the inhibition of equatorial expansion of the vitreous chamber occurring under constant light rearing.The ciliary, sympathetic, or ophthalmic peripheral nerve pathways to the eye are not required either for corneal expansion and anterior segment development under a 12-hr light:dark cycle or for the inhibition of corneal expansion under constant light rearing. The ocular sensory innervation may be a means for regulating vitreous cavity shape.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::f018483ae4d14cbcc2c4acb11842f6bc https://doi.org/10.1080/02713680600738127 Zobrazit plný text záznamu Plný text ve formátu PDF Plný text ve formátu HTML
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