. A treatise on anatomy, physiology, and hygiene : designed for colleges, academies, and families. ot the powerof re-producing itself. If by accident it is discharged, the eyeis irrecoverably lost; while the aqueous humor may be let out,and will be again restored. It is enclosed in a delicate mem-brane, called the hya-loid, which sends processes into theinterior of the globe of the eye, forming the cells in whichthe humor is retained. 904. Describe the vitreous humor. How does this humor differ from theaqueous ? What memorane encloses the vitreous humor ? 400 ANATOMY, PHYSIOLOGY, AND HYGIENE.
. A treatise on anatomy, physiology, and hygiene : designed for colleges, academies, and families. ot the powerof re-producing itself. If by accident it is discharged, the eyeis irrecoverably lost; while the aqueous humor may be let out,and will be again restored. It is enclosed in a delicate mem-brane, called the hya-loid, which sends processes into theinterior of the globe of the eye, forming the cells in whichthe humor is retained. 904. Describe the vitreous humor. How does this humor differ from theaqueous ? What memorane encloses the vitreous humor ? 400 ANATOMY, PHYSIOLOGY, AND HYGIENE. Observation. The structure of this organ can be seen byfirst freezing the eye of a sheep or an ox ; it then can be cutin various directions, and each part separately examined. 905. The muscles of the eye are six in number. Theyare attached, at one extremity, to the bones of the orbit behindthe eye ; at the other extremity, they are inserted by broad,thin tendons, near the junction of the cornea with the scleroticcoat. The white, pearly appearance of the eye is caused bythese tendons. Fig. Fig. 140. A view of the eye and its muscles, a, b, c, d, e, Five of these , The optic nerve. G, The trochlea, or pulley over which one of the muscles bone is seen above and below the eye. Observation. If the external muscle is too short, the eyeis turned out, producing the wall eye. If the internal 905. How many muscles has the eye ? Give their attachments. Whatcauses the pearly appearance of the eye ? What does fig. 140 represent ?What is the effect if the external muscle is contracted ? The internalmuscle ? ANATOMY OF THE ORGANS OF VISION. 401 muscle is contracted, the eye is turned inward toward thenose. It is then called a cross eye. 906. The protecting organs are the Or bits, Eyebrows,Eyelids, and Lachry-mal Apparatus. 907. The orbits are deep, bony sockets, in which theglobes of the eyes are situated. They have the form of acone, the base of which is open and di
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