. Human physiology (Volume 1) . tructures of the orbit, and forms a smooth, hollow sur-face by which the motions of the eye are facilitated. This invest-ment has been variously called, — the cellular capsule of the eye,the ocular capsule, tunica vaginalis oculi, and the submuscularfascia. The sclerotic is the outermost proper coat of the eye. It is thatwhich gives shape to the organ, and which constitutes the whiteof the eye. It is of a dense, resisting, fibrous nature, belonging towhat Chanssier calls the albugineous tissue. Behind, it is pene-trated by the optic nerve ; and before, the corne
. Human physiology (Volume 1) . tructures of the orbit, and forms a smooth, hollow sur-face by which the motions of the eye are facilitated. This invest-ment has been variously called, — the cellular capsule of the eye,the ocular capsule, tunica vaginalis oculi, and the submuscularfascia. The sclerotic is the outermost proper coat of the eye. It is thatwhich gives shape to the organ, and which constitutes the whiteof the eye. It is of a dense, resisting, fibrous nature, belonging towhat Chanssier calls the albugineous tissue. Behind, it is pene-trated by the optic nerve ; and before, the cornea is dovetailed intoit. It has, by some anatomists, been considered a prolongation ofthe dura mater, accompanying the optic nerve ; whilst the choroidhas been regarded as an extension of the pia mater, and the retinaof the pulp of the nerve. The sclerotic is the place of insertionfor the various muscles that move the eyeball, and is manifestlyintended for the protection of the internal parts of the organ. OKGAN OF VISION. 181. Immediately within the sclerotica — and feebly united with itby vessels, nerves, and cellular tissuea — is the choroid coat; —a soft, thin, vascular, andnervous membrane. Itcompletely lines the scle-rotic, and has consequentlythe same shape and , it is perforated bythe optic nerve; before, ithas the iris united with it;and within, it is lined by theretina, which does not how-ever adhere to it, — theblack pigment separatingthem from each other. Itis chiefly composed of the L CarveJ „„e^^,lS», o, re„. v„. Ciliary Vessels and nerves, ticosrc. 2,2. Ciliarv nerves. 3. A long ciliary artery and and consists of two distinct nerve> 4 Ci,iary ligament 5Iris> *-**&-(mi°™llaminae, to the innermost of which Ruysch — the son—gave thename membrana Ruyschiana. In fishes these laminae are veryperceptible, being separated from each other by a substance, whichCuvier considers to be glandular. The choroid is impregnatedand lined
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Keywords: ., bookcentury1800, bookdecade1840, booksubjectphysiology, bookyear1
