Volume 1

Researches in embryology. Ser. 1-2. / [M. Barry].

  • Martin Barry
Date:
1839
Catalogue details

Licence: Public Domain Mark

Credit: Researches in embryology. Ser. 1-2. / [M. Barry]. Source: Wellcome Collection.

    42/60 page 340
    PLATE VIII. Fig. 64. Hog (Sus Scrofa, Linn.). The ovum in its tunica granulosa (gl) at the periphery of (h i) the Graafian vesicle, retained in this situation by (g2) the retinacula (86.). 100 diam. Fig. 65. Mouse (Mus Musculus, Linn.). The same objects; but the ovum (/) in this instance has not reached the periphery of (h i) the Graafian vesicle. c. The germinal vesicle, relatively very large; b. the germinal spot. Fig. 66. Dog (Canis familiaris, Linn.). Four ova in one Graafian vesicle (88. Note), and at or near to its periphery, g2. Retinacula; the central portion of the retinacula (g2) reduced to little more than a membrane, which closely surrounds (g1) the tunica granulosa, and appears to be the cause of the well-defined contour of the latter, as seen in situ in this animal (88. Note). g*. Isolated spots (59.), consisting chiefly of extremely minute oil-like globules accumulated on the peculiar granules of the Graafian vesicle. In this instance these spots were seen to be most numerous around some of the ova. (Plate V. fig. 26^. presents these spots in close aggregation.) Fig. 67- Rabbit (Lepus Cuniculus, Linn.). An appearance frequent in this animal, probably denoting a stage in the absorption of the ovum (60.). f. Dis- tended chorion; d. altered yelk ; c. the enlarged germinal vesicle; b. the enlarged germinal spot; h i. Graafian vesicle. (The tunica granulosa and retinacula have disappeared.) 100 diam. Fig. 68. Dog (Canis familiaris, Linn.). A patch of ovisacs (//) -jf to f in length, some of them passing into the state of Graafian vesicles, and among these two (h i) that have become opake from the coverings acquired. One of the ovisacs contains two ova (88. Note), g. Granules of the ovisac (in- cipient retinacula?). Fig. 69. Sheep (Ovis Aries, Linn.). The cavity in which the ovisac is often found (6.). The ovisac (h) having been ruptured, the ovum (f) has escaped, and is seen to have become flattened by pressure. The ovum bursting before its exit, left behind its germinal vesicle (c). b. Germinal spot; g. peculiar granules of the ovisac; Zr. substance in which the ovisac is imbedded. 60 diam. Fig. 70. Cat (Felis Cat us, Linn.). The chorion (f) not yet of such consistence as to resist even very gentle pressure, which, applied on one side, has forced the now semifluid substance of the chorion to the other side (53.). e. Mem- brana vitelli (49. 53.) ; d. the yelk in an incipient state. 440 diam. Fig. 71- Hog (Sus Scrofa, Linn.). Portion of the inembrana granulosa (g:i) re- moved from the Graafian vesicle (73.). 100 diam. Fig. 72. Man (from Bernhardt). An ovum after maceration (50. 56.). d. The yelk ; f. the chorion. The internal surface of the latter is the “ mem-
    digitised image 1
    digitised image 2
    digitised image 3