Lectures on diseases of the eye / by N.C. Macnamara. Part I., Referring principally to those affections requiring the aid of the ophthalmoscope for their diagnosis.

  • Macnamara, Nottidge Charles, 1832-1918.
Date:
1866
Catalogue details

Licence: Public Domain Mark

Credit: Lectures on diseases of the eye / by N.C. Macnamara. Part I., Referring principally to those affections requiring the aid of the ophthalmoscope for their diagnosis. 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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    fibres proceeding from the margin of the inner lamina of the cornea, some of which may be traced into it. A second set, arising from the margin of the cornea, were mentioned as passing posteriorly to the ciliary processes j some of these, too, may be traced into the iris; they also separate the circumference of the iris from the ciliary muscle. In addition to this fibrous structure, the iris contains a longitudinal and circular set of muscular fibres, connective tissue, pigment cells, vessels and nerves. Its anterior surface is free and bathed by the aqueous humour; its posterior surface rest against the lens, and its inner margin forms the circumference of the pupil. It contains a vast number of pigment cells; those on its posterior surface being directly continuous with the epithelium covering the elastic lamina of the ciliary processes. The muscular fibres of the iris are of the unstriped variety, and may be divided into two sets; the outer, or radiating, which are described as running in fasciculi from without inwards, forming the dilatator pupilla?, and the internal circular fibres, which constitute the constrictor pupilla?. The vessels of the iris pursue a similar course; they are of small size, and are derived from the long ciliary arteries, which perforate the sclerotic posteriorly; they pass along in the ciliary muscle till they reach the outer margin of the iris, when they divide and form a zone round its outer border, sending off branches to it and also to the ciliary muscle. The nerves are supplied by the long ciliary branches of the nasal nerve, and also by the sympathetic;