. An analytical compendium of the various branches of medical science, for the use and examination of students. Anatomy; Physiology; Surgery; Obstetrics; Medicine; Materia Medica. THE EYE AND ITS APPENDAGES. 173 Fig. The ciliary muscle is a small, gray structure, behind the ciliary ligament,'^ and covering the outside of the ciliary processes. Its contraction presses the lens" towards the cornea.'' The iris^ (fig. 149,) is a thin, cir- cular membrane,^ consisting of contrac- tile tissue, and forming a vertical septum, between the anterior and posterior cham- bers of the eye. It is p
. An analytical compendium of the various branches of medical science, for the use and examination of students. Anatomy; Physiology; Surgery; Obstetrics; Medicine; Materia Medica. THE EYE AND ITS APPENDAGES. 173 Fig. The ciliary muscle is a small, gray structure, behind the ciliary ligament,'^ and covering the outside of the ciliary processes. Its contraction presses the lens" towards the cornea.'' The iris^ (fig. 149,) is a thin, cir- cular membrane,^ consisting of contrac- tile tissue, and forming a vertical septum, between the anterior and posterior cham- bers of the eye. It is perforated nearly in the centre by a foramen called the pupil,'^ which in foetal life is closed by the membrana pupillaris. Its external border is attached to the ciliary ligament. The anterior surface is flat, of a bluish or brown colour, speckled and striated; towards the pupil the colour is deeper. Its posterior surface (some- times called the uvea), is covered with a thick layer of pigmentum nigrum, and is in contact with the ciliary processes. It may con- tain a few muscular fibres in its structure. It is supplied by the ciliary arteries, branches of the ophthalmic, and by the ciliary nerves, which pass from the lenticular ganglion through the choroid coat to be distributed upon it. • The retina,^ is a soft, white membrane within the choroid coat, and is considered by some to be an expansion of the optic nerve, and by others as a distinct nervous structure in connexion with the optic nerve. Internally it is in contact with the vitreous humour. It commences at the optic nerve, and terminates anteriorly by a jagged edge, called ova serrata, behind the ciliary body. It is thicker behind than it is in front. When perfectly fresh it has a pinkish tint, and is semi-transparent. Its inner surface is of a fibrous character, consisting of radiating tubular fibres of the optic nerve. Its external surface consists of a finely granulated matrix, interspersed with very delicate vessel
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