. A treatise on practical anatomy: for students of anatomy and surgery . regnancy, and subserve the func-tion of lactation. They are surmounted by a conicalstructure,—the nipple. The skin of the nipple, and forsome distance surrounding it, is deeply pigmented andabundantly provided with large sebaceous follicles. Thegland-tissue of the mammse consists of lobes, these oflobules, these of clusters of vesicles. They are lined byepithelium which, during lactation, undergoes fattychange. The vesicles empty into minute tubuli, theseinto larger, and finally converge to form from fifteen totwenty duct
. A treatise on practical anatomy: for students of anatomy and surgery . regnancy, and subserve the func-tion of lactation. They are surmounted by a conicalstructure,—the nipple. The skin of the nipple, and forsome distance surrounding it, is deeply pigmented andabundantly provided with large sebaceous follicles. Thegland-tissue of the mammse consists of lobes, these oflobules, these of clusters of vesicles. They are lined byepithelium which, during lactation, undergoes fattychange. The vesicles empty into minute tubuli, theseinto larger, and finally converge to form from fifteen totwenty ducts that open on the surface of the nipple. 412 PRACTICAL ANATOMY. They form slight dilatations, which become milk reser-voirs. Between the lobes of the mammee is a largeamount of fat. The lobules are held together by con-nective tissue. The breasts are abundantly suppliedwith blood. SPECIAL SENSES. THE EYE. The eye is the organ of sight. It is placed in theorbital cavity, which protects it from injury. The eye-ball is movable in all directions by the muscles attached. Fig. 178.—Diagram of a Horizontal Section Through the Human Eye. 1, cornea; 2, sclerotic ; 3, choroid; 4, ciliary processes : 5, suspensory ligament of lens :6, so-called posterior chamber between the iris and the lens : 7, iris ; 8. optic nerve : 8, en-trance of central atery of retina; 8. central depression of retina, or yellow spot; 9,anterior limit of retina ; 10. hyaline membrane; U,; 12,crystalline lens;13, vitEBOos humor; 14, circular venous sinus which lies around the cornea; a a, antero-posterior, and b b, transverse axes of bulb, to it, and is capable of a wide range of vision. It isimbedded in a quantity of loose fat, from which it isseparated by a flattened serous sac,—the capsule ofTenon. The eyeball consists of the segments of twospheres,—a smaller anterior, constituting one-sixth, and (413) 414 PRACTICAL ANATOMY. a larger posterior portion, which forms five-sixths of theeyebal
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectanatomy, bookyear1891
