734 



THE NERVES OF THE CORNEA. 



planes immediately above and below them. In a section stained with gold chloride, they 

 Ereaent the appearance seen in fig. 512. In a vertical section of the cornea, they appear 

 Srm andtSl to the free sm-face of the cornea (fig. 514) If the cornea of a frog be 

 pencilled with silver nitrate, the eement-snbstance between the lamelhe is blackened, and the 

 branched cell-spaces remain clear, as in fig. 513. The one figure represents, as it were, the 

 positive, ami the other the negative image.] 



Hlucocvtes also pass into these lymph-spaces or juice-canals. The importance of these 

 leucocyte; in inflammation is referred to In 200. 4. The transparent, structureless posterior 

 elastic membrane Id), the membrane of Descemet or Demours, is in many animals fibrillated, 

 and shows evidence of stratification, while towards the margin of the cornea there are 

 occasionally slight conical elevations. This membrane is very tough and very resistant (of 

 neat LmportanS in inflammation). If it be removed, it rolls up towards the convex side. At 

 its periphery it becomes continuous with the fibro-elastic reticulated ligamentum pectiuatum 

 i, id s whose trabecule are covered by epithelium. 5. The posterior single layer of epithelium 



Fig. 514. 

 Antero-posterior section at the junction of the cornea with the sclerotic, a, anterior corneal 

 epithelium ; b, Bowman's lamina ; c, corneal corpuscles ; I, corneal lamellae (the whole 

 thickness lying between b and d is the substantia propria cornea) ; d, Descemet's mem- 

 brane ; e, its epithelium ; /, junction of cornea with the sclerotic ; g, limbus conjunctivae ; 

 h, conjunctiva ; i, canal of Schlenuu ; k, Leber's venous plexus (is regarded by Leber as 

 belonging to i) ; m, m, meshes in the tissue of the lig. iridis pectinatum ; n, attachment 

 of the iris ; o, longitudinal, p, circular (divided transversely) bundles of fibres of the 

 sclerotic ; q, perichoroidal space ; , meridional [radiating], t, equatorial (circular) bundles 

 of the ciliary muscle ; u, transverse section of a ciliary artery ; v, epithelium of the iris (a 

 continuation of that on the posterior surface of the cornea) ; w, substance of the iris ; x, 

 pigment of the iris ; z, a ciliary process, 

 consists of flat, delicate, nucleated cells (e), which are continued from the margin of the cornea 

 on to the anterior surface of the iris {v). Fine juice-canals exist in the spaces between the indi- 

 vidual cells (v. Eecklingliausen). These spaces communicate with a system of fine tubes under 



