. The American journal of anatomy. Fig. 14. Fig. 15. Fig. 14. Diagram of the position of tbe sphincter buds arising from the pigmentlayer of the iris in a chick 13 days old. Mag. dia. Sph/ and Sph/^ correspond tosame in figures 11 and 12. Fig. 15. Radial section of margin of optic cup of chick 6 days, 23 hours old. dia. A., angle between sphincter bud and inner layer. by multiplication of cells in both the inner layer and the hud. Thetendency to narrowing of the pupil is more than counteracted by thegeneral expansion of the optic cup. CONCLUSIOXS. Most, if not all, of the wanderin
. The American journal of anatomy. Fig. 14. Fig. 15. Fig. 14. Diagram of the position of tbe sphincter buds arising from the pigmentlayer of the iris in a chick 13 days old. Mag. dia. Sph/ and Sph/^ correspond tosame in figures 11 and 12. Fig. 15. Radial section of margin of optic cup of chick 6 days, 23 hours old. dia. A., angle between sphincter bud and inner layer. by multiplication of cells in both the inner layer and the hud. Thetendency to narrowing of the pupil is more than counteracted by thegeneral expansion of the optic cup. CONCLUSIOXS. Most, if not all, of the wandering pigmented cells in the stroma aboutthe anterior portion of the optic cup during the first 14 days, and prob-ably later, arise from buds of the pigment or outer layer of the optic cupand are thus ectodermal in origin. The ]\I. sphincter pupillae anlage is formed not only l)y Imds from thepupillary margin, but its peripheral portion is formed by many distinctbuds arising from the pigment layer some distance lateral to the pupil-la
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectanatomy, bookyear1901
