Identifier: elementsofanimal00ange (find matches)
Title: Elements of animal physiology, chiefly human
Year: 1873 (1870s)
Authors: Angell, John
Subjects: Physiology Anatomy Physiology Anatomy
Publisher: New York : Putnam
Contributing Library: Francis A. Countway Library of Medicine
Digitizing Sponsor: Open Knowledge Commons and Harvard Medical School

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see the externalobjects themselves, but pictures of them formed by ilielight sent from them, and focussed on the back of the•eye (the retina), as just described. The eye is, infact, a sort of water camera obscura: it is moved bysix muscles attached to its external coat (the sclerotic).The eyes are lodged, for protection, in packings of fatin the orbits of the cranium. 166 ANIMAL PHYSIOLOGY. 371. structure of the Eye.—The eye i« a nccaily roundball, about 1 inch in diameter, which encloses threelenses or humours and tv^o muscles, and which consistof three coats or layers. It also contains nerves and blood-vessels. It is attached to the oj^ftic nerve behind, as anapple to its stalk. Coats of the Eye. Kefracting Humours. 1. (Outer) Sclerotic and cornea, Aqueous, Muscles.The Iris. 2. (Middle) Ir!s, ciliary, and choroid, Crystalline (lens), ^ ^^^^^^J 3. (Inner) Eetina, Vitreous. / muscle. Meibomian Glands Crystalline Vitreousin upper Eyelid. Lens. humour. Ciliary processesand Muscle.
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Ilcibomian Glands^in lower Eyelid. Canal of Petit roundtlie Crystaliiup Lens. levator PcJpehraoi^u2:>eriorU.-(Rlev.itor Mlscle ofthe uijper Eyelid.)^ __Superior RectusS=^ Muscle, ^fef. ■Sclerotic Coat.^--Choroid Coat.Retina. ~ Optic Nerve.—(Its termiuati.nfovuiing the^ _ Blind Sput.) g-^~;-j--Adipose Tissue. Inferior PectusjM uscle. Sclerotic Retina. Coat. rig. 78. Vertical Section of Eye-Ball. 372. The Sclerotic Coat (from Gr. slderos, hard) formsthe external wall of the eye-ball, the white of the eye.It is an ojDaque, tough, fibrous membrane, which cutslike leather, and consists chiefly of white fibrous tissue.It contains two apertures—the circular ppening in front,in which the cornea is inserted, and the posterior open-ing through which the optic nerve enters. (See fig. 78.) 373. The Cornea (from Lat. cornu^ horn) is the cir- THE CRYSTALLINE LENS OR HUMOUR. l67 cular watch-glass shaped, transparent, fibrous bodyinserted in the aperture in the sclerotic coat, at thefront of

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