. The anatomy of the domestic animals. Veterinary anatomy. THE VASCULAR TUNIC 865 practically homogeneous membrane which is less intimately attached to the sub- stantia propria than the anterior lamina. It is clear, glistening, and elastic. At the periphery the lamina divides into three sets of fibers. The anterior fibers join the sclera, the middle give attachment to the ciliary muscle, while the posterior pass into the iris and form the ligamentum pectinatum iridis. (5) The endothelium of the anterior chamber (Endothelium camerse anterioris) consists of a layer of flattened polygonal cells,
. The anatomy of the domestic animals. Veterinary anatomy. THE VASCULAR TUNIC 865 practically homogeneous membrane which is less intimately attached to the sub- stantia propria than the anterior lamina. It is clear, glistening, and elastic. At the periphery the lamina divides into three sets of fibers. The anterior fibers join the sclera, the middle give attachment to the ciliary muscle, while the posterior pass into the iris and form the ligamentum pectinatum iridis. (5) The endothelium of the anterior chamber (Endothelium camerse anterioris) consists of a layer of flattened polygonal cells, and is reflected on to the anterior surface of the iris. The cornea is non-vascular except at its periphery, where the terminal twigs of the vessels of the sclera and conjunctiva form loops. The nerves are derived from the ciliary nerves. They form a plexus around the periphery (Plexus amiularis), from which fibers pass into the substantia propria, become non-medullated, and form the funda- mental or stroma plexus. From this perforating branches go through the anterior limiting layer and form a subepithelial plexus, from which filaments pass between the epithelial cells. Other branches from the plexuses in the substantia propria end as fibrils which are in close relation with the corneal corpuscles. The Vascular Tunic The vascular tunic (Tunica vasculosa oculi) lies internal to the fibrous coat; it comprises three parts—the chorioid, the ciliary body, and the iris. 1. The chorioid (Chorioidea) is a thin membrane which lies between the sclera and retina. It is in general rather loosely attached to the sclera by the lamina fusca, but is intimately adherent at the point of entrance of the optic nerve and less closely in places where the ciliary vessels and nerves pass through. The inner surface is in contact with the layer of pigmented cells of the retina, which adhere so closely to the chorioid that they were formerly regarded as a part of the latter. The general color of the c
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