. Elements of histology. Histology. jprnpfrtn o( l\ft ^sjuciaiimi uf i^e ^^lumni of t^e CoUtgc of I^DS. & gfto fork, Elements of Histology. CHAPTER I. CELLS. 1. The ripe oviiiii (Fig. 1) of man and mammals is a minute spherical mass of a soft, gelatinous, trans- parent, granular-looking substance, containing nume- rous minute particles—yolk globules. It is invested by a radially striated delicate membrane called the zona pellucida. Inside this mass, and situated more or less excentrically, is a vesicle— the germinal vesicle — and inside this, one or more solid spots — the germinal
. Elements of histology. Histology. jprnpfrtn o( l\ft ^sjuciaiimi uf i^e ^^lumni of t^e CoUtgc of I^DS. & gfto fork, Elements of Histology. CHAPTER I. CELLS. 1. The ripe oviiiii (Fig. 1) of man and mammals is a minute spherical mass of a soft, gelatinous, trans- parent, granular-looking substance, containing nume- rous minute particles—yolk globules. It is invested by a radially striated delicate membrane called the zona pellucida. Inside this mass, and situated more or less excentrically, is a vesicle— the germinal vesicle — and inside this, one or more solid spots — the germinal spot or spots. The gela- tinous transparent substance of the ovum, containing a very large percentage of proteid material, is called protoplasm. Before and immediately after fertilisa- tion, the protoplasm of the ovum shoAv^s distinct movement, consisting in contraction and expansion. These movements are spontaneous— not caused by any directly visible external influence. The diameter of the ripe ovum in man and do- mestic animals varies between ^^^ and y^^ of an inch. But before it ripens the ovum is considerably. V--^-c Fig. 1.—Ripe Ovum of Cat. a, Zona pellucida; h, gerniinal vesicle; c, Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Klein, E. (Edward), 1844-1925; Edkins, John Sydney, b. 1865. Philadelphia : Lea Brothers
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