. Surgery, its principles and practice . ome infected, they give riseto inflammation of the ciliaryregion of the opposite eye in the form of so-called sympathetic ophthal-mitis. At the anterior end of the sclera in its deeper layers, and passing circu-larly around the cornea, is the scleral sinus, or canal of Schlemm, which is avenous channel, and just in front of which, at the corneal limbus, thesclerotic merges, first through its deeper and finally through its superfi-cial layers, into the other portion of the external fibrous tunic, which isknown as the cornea. The important relation of the
. Surgery, its principles and practice . ome infected, they give riseto inflammation of the ciliaryregion of the opposite eye in the form of so-called sympathetic ophthal-mitis. At the anterior end of the sclera in its deeper layers, and passing circu-larly around the cornea, is the scleral sinus, or canal of Schlemm, which is avenous channel, and just in front of which, at the corneal limbus, thesclerotic merges, first through its deeper and finally through its superfi-cial layers, into the other portion of the external fibrous tunic, which isknown as the cornea. The important relation of the canal of Schlemmto the filtration of the internal ocular fluids through the anterior chamber,which will presently be described, must be kept clearly in mind, as mustalso the anatomy of the structures, superficial and deep, at this juncture,ordinarily known as the corneoscleral function (Fig. 455). The cornea constitutes the anterior one-sixth of the external fibroustuniC; is thickest at its periphery, where its diameter is mm., and. Fig. 454.—The Eyeball in situ with its Muscles AFTER Removal of Surrounding Farts of Orbital Contents (Testut). 1, Eyeball; 2, superior rectus; 3, levator pal- pebrse; 4, inferior rectus; 5, internal rectus; 6, external rectus; 7, inferior oblique; 8, superior oblique; 8, pulley and reflected tendon of same. ANATOMIC CONSIDERATIONS. 855 thinnest at its center, mm. It is composed of five layers: Anexternal epithelial layer derived from the conjunctiva, beneath whichis a homogeneous layer known as the anterior elastic membrane. Follow-ing this is the true substance of the cornea, succeeded by a posterior limit-ing membrane upon which rests the posterior endothelium. The cornealsubstance proper is composed of lamellae of fibrous tissue, in many placesseparated by intervening clefts which constitute the so-called cornealspaces, and from these pass minute ramifications, the corneal canals,that communicate with adjacent spaces. These intercommu
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