Quain's elements of anatomy . have been obtained by such modes ofpreparation it has been conjectui-ed by various observers that at least in thispart the vitreous substance is divided into compartments by a number of deli-cate membranes arranged concentrically and parallel to the surface; but the THE VITEEOUS BODY. 423 existence of such membranous partitions has not been conclusively however, the vitreous substance does in some way consist of a firmermaterial—whether or not in the shape of continuous membranes—enclosing inits meshes the more fluid portion, is shown by the fact
Quain's elements of anatomy . have been obtained by such modes ofpreparation it has been conjectui-ed by various observers that at least in thispart the vitreous substance is divided into compartments by a number of deli-cate membranes arranged concentrically and parallel to the surface; but the THE VITEEOUS BODY. 423 existence of such membranous partitions has not been conclusively however, the vitreous substance does in some way consist of a firmermaterial—whether or not in the shape of continuous membranes—enclosing inits meshes the more fluid portion, is shown by the fact that if either the whole ora piece of the vitreous humour be thrown upon a filter, a small proportion alwaysremains upon the latter ; although by far the larger part drains away, and maybe collected as a clear watery fluid. Fig. 358.—Horizontal section of the horses eye, hardened in chromic ACID (after Hannover). The vitreous iumour appears concen-trically and meridionally striated through-out its whole In addition to the above-mentionedconcentric striation, a radial markinghas also been observed in sectionsof vitreous humour made trans-versely to the axis of the eyeball(fig. 359), but whether there is anypre-existent structure to account forthe appearance is not known. It isconceivable that these appearancesmay be merely produced by the manner in which the albuminous substance hasundergone coagulation by the reagent employed. However this may be, there exists, nearly but not quite in the axis ofthe eye, a definite structure in the shape of a distinct canal, about a twelfthof an inch in diameter, filled with fluid and extending from the j(?a/)^7/(3^optici to the back of the lens-capsule, where it ajDparently terminatesblindly. This is the canalis liyaloideus or canal of Stilling. It is bestshown in the fresh eye, and may be also injected by forcing a colouredsolution under the pia-matral sheath of the optic nerve (Schwalbe).The canal widens somewhat towa
Size: 1638px × 1526px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., boo, bookcentury1800, booksubjectanatomy, booksubjecthumananatomy
