The Continuation of the Narrative of Miss Margaret Mavoys Case With General O
The Continuation of the Narrative of Miss Margaret Mavoys Case With General O
Thomas Fenwick
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112 scribed it as being only connected with this coat by the medium of the ciliary circle. It is probably the most acutely sensible part of the human body ; being compos- ed of muscular fibres, a profusion of blood vessels, and of nerves. This opinion of the muscularity of the Iris, is confirmed, particularly from analogy, with the Iris, of some species of the Parrot, which possesses a voluntary power of contracting and dilating the pupil, and from muscular fibres having been observed in the Ir...is, of some of the larger animals. Other anatomists deny the mus- cularity of the Iris, and Wrisberg, in dissecting that of an Ox, affirms, no muscular fibres could be seen, and he thought sufficient proof had been advanced against its muscularity, in the fact, of it not contracting when light falls upon its surface. The abbe Mariotte, who opposed Descartes, and other philosophers in the supposition of the retina receiving the impression of light, and conveying it to the sensorium, was the discoverer of this curious fact, that when the rays of light fall upon the centre of the optic nerve, they give no sensa- tion.
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