Health knowledge : a thorough and concise knowledge of the prevention, causes, and treatments of disease, simplified for home use . The Eye. The eyeball is an almostperfect sphere of about aninch in diameter, the frontpart bulging slightly for-ward. It has three coats,the outerprotective fibrouscovering being white andopaque except in the moreprominent front part,where it is transparentand forms the sclerotic is continued The Organ of Sight.—The sense-organ of sight is the eye, the es-sential part of which is the eyeball,contained in a bony cavity in thefront of the skull, the orbit
Health knowledge : a thorough and concise knowledge of the prevention, causes, and treatments of disease, simplified for home use . The Eye. The eyeball is an almostperfect sphere of about aninch in diameter, the frontpart bulging slightly for-ward. It has three coats,the outerprotective fibrouscovering being white andopaque except in the moreprominent front part,where it is transparentand forms the sclerotic is continued The Organ of Sight.—The sense-organ of sight is the eye, the es-sential part of which is the eyeball,contained in a bony cavity in thefront of the skull, the orbit, com-municating with the brain by theoptic nerve, and moved in the cavityby a set of small Side View of the Eyeball. behind on to the optic nerve, which pierces it. The middle coatconsists of the choroid membrane, the ciliary processes, a,nd theiris, the first of which does not extend quite so far forward asthe canal of Schlemm, being deeply colored with pigment cellsand containing a great number of fine blood-vessels running init; the ciliary processes extend radially round the eyeball at the junction of the sclerotic and cor-nea, containing the radiating fi-bers of the ciliary muscle, the func-tion of which is to regulate thelens in accommodating the eyeto near objects; while the irisis a thin, colored, membranousMuscles of the EyebaU. curtain hanging in front of the
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectmedicin, bookyear1920
