X-RAY AllCKOSCOI'Y 



their opinion. Their technique was used by unknowns cannot be solved by a few investi- 



Barlow, Bentley and Walder (li)51) (9) in gations. 



their further microradiographical studies of Great progress was ac-hieved through 



the atrio-venous shunt in stomach wall; 400 microvasography in the knowledge of the 



n thick sections were used in this study. They vascular supply of the optic pathways in the 



re-asserted that shunts do exist and that ophthalmological clinic of Liege University 



their approximate size is 140 ix. by works of Frangois, Neetens and Collette 



Serious objections to the conclusions of all (()4) (65) (66) (67) (()8) (69). Making use of 



the above authors w^re brought by Bellman thorotrast, for injection these authors stud- 



(12) and especially by Herzog (74). Bellman ied the blood circulation of the chiasma, 



(1953) injected vessels of a resected stoma(;h geniculate body, optic nerve and other parts 



30 minutes after surgery. His microradio- of optic pathways at capillary level. All their 



graphical findings are in disagreement with conclusions are supported by precise micro- 



the ones mentioned above. He found quite radiographs. They used comparatively thick 



adequate filling of the mucosal capillaries in sections (150-400 /x) in order to study large 



all his specimens. Herzog (1957) used 278 areas of the capillary bed. 



specimens of resected stomachs in his In one of their works authors studied 



study. Blood vessels were injected with 15% via microradiography the structure of 



silver iodide; 400 jj. thick sections were Schlemm's canal (66). They found numerous 



studied of which 3,000 microradiographs pores in the inner wall of this canal through 



were prepared. Herzog found the shunt men- which communication occurs between the 



tioned above only in one case. He could not vitreous of the anterior chamber and the 



find definite changes either in niunber of canal. These pores were seen in microradio- 



capillaries or in their morphological proper- graphs after the injection of thorotrast or 



ties. Herzog is rather pessimistic; he con- angiopac either into the anterior chamber or 



siders any conclusions about the vascular into Schlemm's canal. The authors surmise 



function via microradiography to be impos- that the obstruction of the pores prevents 



sible. He thinks many of the findings are un- free communication between the vitreous of 



certain. Making use of some drugs with a the anterior chamber and Schlemm's canal 



strong spastic action Herzog could not find with the resulting increase of intraocular 



any break in the blood circulation in areas of pressure, and this leads to the development 



the stomach wall close to the ulcer (drugs of glaucoma. A further contribution to glau- 



were injected either with silver iodide or coma research was made by the same au- 



bef ore it) . thors through their study of the influence of 



The contradictory results of the workers hyaluronidase on the pores (68). According 



mentioned above prove only the necessity of to Barany large molecules of polymerized 



further studies in this important branch of hyaluronic acid, w^hich is known to be pres- 



gastric pathology. First of all the technique ent within the wall, may block the narrow 



has to be identical if one would make con- pores and consequently provoke glaucoma, 



elusions of equal validity. In this technique This hypothesis was refuted by Frangois 



everything counts: opaque medium used, the et al, who found that on the contrary many 



method of injection and type of OM, period new openings make their appearance after 



of time between resection and injection and the injection of hyaluronidase into the 



between injection and microvasography, anterior chamber or after treatment of the 



type of narcosis used during surgery, his- wall with this enzyme. 



tological and microradiographical tech- Morphological findings of Frangois et al. 



niques, etc. Such an equation with so many were confirmed by Pattee et al. (1957) (95) 



614 



