Abstract
The arrangement of the connective-tissue fibres in the stroma of the iris of man and monkey ( Macaca sp.) was studied with the scanning electron microscope. The stroma consists of a series of wide-meshed networks of collagenous connective-tissue bundles which run parallel to the surfaces of the iris. The rectangular areas isolated by the fibres of these networks are orientated in adjacent layers to form anterior-posterior canals. These canals communicate directly with the anterior chamber of the eye and extend to the muscles of the iris. The blood vessels of the iris are enveloped in sheaths of connective tissue. These sheaths consist of a number of layers of tightly woven networks of collagen fibres. Around the vascular tube the fibre bundles form more or less tight spirals and coil in alternate directions in conseeutive layers. The possible functional significance of this arrangement of the connective tissue in the stroma iridis is discussed.
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