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KMID : 0376219830200010045
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Chonnam Medical Journal
1983 Volume.20 No. 1 p.45 ~ p.58
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The Fine Structure of the Suncus Murinus Iris and the Identification of Adrenergic and Cholinergic Nerve Fibers in its Intrinsic Muscles.
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Abstract
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The fine structure of the iris and the nature of the nerve fibers in its intrinsic muscles of non treated control and 5-hydroxydopamine-administered Suncus mourns were studied with electron microscope. The pigment epithelium of the iris consisted of two layers of pigmented cells. Intercellular spaces containing microvilli were observed between anterior and posterior layers. The anterior surface of the iris was found to consist of fibroblasts, melanocytes, and collagenous fibers. No specialized anterior endothelium could be identified. A few pigment granules similar in size, shape, and internal structure to those found in pigment epithelium were present in the cytoplasm of sphincter and dilator muscles. Groups of myelinated and nonmyelinated nerve fibers were observed throughout the stroma of the iris. In non treated control, adrenergic nerve terminal of the intrinsic muscle contained both granular and a granular vesicles, whereas cholinergic nerve terminal contained a granular vesicles and mitochondria.
After the administration of 5-hydroxydopamine, a "false adrenergic transmitter", core materials within a granular and granular vesicles of the adrenergic nerves increased in density, while a granular vesicles in cholinergic fibers did not change.
The nerves found in the dilator and the sphincter muscles contained both adrenergic and cholinergic nerve fibers. however, the former was innervated predominantly by adrenergic nerve and the latter was innervated mainly by cholinergic nerve.
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