Lectures on the early stages in the development of mammalian ova and on the formation of the placenta in different groups of mammals / by Arthur Robinson.

  • Robinson, Arthur.
Date:
[1903]
Catalogue details

Licence: In copyright

Credit: Lectures on the early stages in the development of mammalian ova and on the formation of the placenta in different groups of mammals / by Arthur Robinson. Source: Wellcome Collection.

Provider: This material has been provided by The Royal College of Surgeons of England. The original may be consulted at The Royal College of Surgeons of England.

    22/26 (page 204)
    the figure round the bodies of the ova and the inner boundaries of the membrante granulosse are merely limiting lines, and are not intended to indicate membranes, x 250. Fig. 8. Section of the ovum of a mouse from an almost mature Graffian follicle. This ovum is at the same stage of development as the ovum repre- sented in fig. 4, but the zona pellucida is extremely thin ; nevertheless it is closely connected with the inner ends of some of the cells of the membrana granulosa, x 250. Fig. 9. Ovum of a cat at a stage of development intermediate between the stages of ferrets’ ova represented in figs. 2 and 3, but the zona pellucida is much thicker than in the latter ova, and it presents a laminated appearance. On its outer surface there is a granular layer with which the cells of the membrana granulosa are continuous, x 200. Fig. 10. Ovum of a cat at the same stage of development as the rat’s ovum re- presented in fig. 8. The zona pellucida of the cat at this stage is much thicker than that of the rat, but it is equally closely connected with the inner ends of the cells of the membrana granulosa, x 150. Figs. 11, 12 and 13 are diagrams representing different stages of the develop- ment of the hedgehog. Figs. 14, 15 and 16 represent three stages of development of the ovum of the roe deer. Figs. 17, 18, 19 and 20 are diagrams representing four stages in the develop- ment of the ovum of the rat. Figs. 21, 22 and 23 are diagrams representing three stages in the development of the bat Hippocrepis vulgaris.