The influence of changes in the intraocular circulation on the intraocular pressure / by E.E. Henderson and E.H. Starling.

  • Henderson, Edward Erskine, 1870-1929.
Date:
1904
Catalogue details

Licence: In copyright

Credit: The influence of changes in the intraocular circulation on the intraocular pressure / by E.E. Henderson and E.H. Starling. Source: Wellcome Collection.

Provider: This material has been provided by The Royal College of Surgeons of England. The original may be consulted at The Royal College of Surgeons of England.

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    The intraocular pressure fell to 9, showing that the eye had been receiving some blood by collaterals or through the circle of Willis. On relaxing, at the end of 2 minutes, the ligature round the right verte- bral and subclavian, the blood-pressure fell to 140, and the intraocular pressure rose to 12. And on finally relaxing the right carotid the blood- pressure fell to 116, and the intraocular rose to 20 (Fig. 2, B). The same complete parallelism between the changes in the local blood- pressure and changes in the intraocular pressure is obtained when the changes in blood-pressure are produced not by mechanical means, but by vaso-constriction or dilatation in other portions of the vascular area. Thus, stimulation of the depressor nerve in the cat causes a fall of intraocular pressure. Stimulation of the peripheral end of the divided splanchnic causes a rise of arterial pressure, and a simultaneous rise of intraocular pressure. Thus in the experiment represented in Fig. 3, on stimulation of the splanchnic nerve the blood-pressure rose from 122 to 214; and the intraocular pressure rose from 16 to 24, falling again to its original height as the blood-pressure fell on discontinuing the stimu- lation. Effects of asphyxia. Although as we shall see later on the eyeball is supplied with vaso- constrictor fibres, stimulation of which has a distinct influence on intra- Fig. 4. Asphyxia in a dog. Blood-pressure measured in left carotid, intraocular pressure in right eye.