. Cunningham's Text-book of anatomy. Anatomy. THE EYELIDS. 821 oculi anterior in front and the camera oculi posterior behind. These are filled with the aqueous humour, and, in the adult, communicate freely through the aperture of the pupil, but in the foetus are separated from each other by the membrana pupillaris. The camera oculi anterior or anterior chamber is bounded in front by the cornea, behind by the iris and lens, whilst peripherally it communicates with the spatia anguli iridis. The camera oculi posterior or posterior chamber is triangular on section, and is bounded in front by the i
. Cunningham's Text-book of anatomy. Anatomy. THE EYELIDS. 821 oculi anterior in front and the camera oculi posterior behind. These are filled with the aqueous humour, and, in the adult, communicate freely through the aperture of the pupil, but in the foetus are separated from each other by the membrana pupillaris. The camera oculi anterior or anterior chamber is bounded in front by the cornea, behind by the iris and lens, whilst peripherally it communicates with the spatia anguli iridis. The camera oculi posterior or posterior chamber is triangular on section, and is bounded in front by the iris, behind by the circumferential part of the lens and its suspensory ligament; the base of the triangle corresponds with the thick, anterior extremities of the ciliary processes. It communicates with the recessus cameree posteriores and spatia zonularia. The aqueous humour has a refractive index of about 1-336, and consists of about 98 per cent of water, with 1-4 per cent of sodium chloride, and traces of albumen. PALPEBEiE. The eyelids are two movable curtains situated in front of the bulb of the eye, and named, from their positions, superior and inferior. The superior is the larger and more movable, being provided with a special elevator muscle, the m\ levator palpebrce swperioris. The inter- val between the eyelids is termed the palpebral fissure, and measures transversely about 30 mm., but varies con- siderably in different individuals and in different races. When the eye is open the fissure is elliptical in shape, but when closed it assumes the form of a transverse slit, which lies on a level with the lower margin of the cornea. The two lids meet at the extremities of the fissure, and form the lateral and medial commissures. Their free margins are flat- tened and are sur- mounted by eyelashes, from the lateral commissure to a point about 5 mm. from the medial commissure—a point indicated by a small papilla, the papilla lacrimalis. Medial to this papilla the margins are
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectanatomy, bookyear1914
