Definitions

from The Century Dictionary and Cyclopedia

  • n. In embryology, a layer of cells; specifically, the same as germ-layer, or one of the embryonic layers of cells — ectoderm, mesoderm, entoderm — from which the organs of the animal body are developed.

Etymologies

Sorry, no etymologies found.

Examples

  • B longitudinal section through the axis, g primitive-gut cavity, a primitive mouth-aperture, i inner cell-layer (entoderm, endoblast, gut-layer), e external cell-layer (outer germinal layer, ectoderm, ectoblast, or skin-layer).

    The Evolution of Man — Volume 1

  • The outer covering is the simple cell-layer of the epidermis (E).

    The Evolution of Man — Volume 2

  • Its functions are represented by the simple cell-layer of the ectoderm, which the lower Metazoa have inherited from the Gastraea

    The Evolution of Man — Volume 2

  • As regards the remaining organs of the Amphioxus, we need only mention that the gonads or sexual glands are developed very late, immediately out of the inner cell-layer of the body-cavity.

    The Evolution of Man — Volume 2

  • In these cases the simple cell-layer of the ectoderm is at once skin, locomotive apparatus, and nervous system.

    The Evolution of Man — Volume 2

  • The episomites or dorsal coelom-pouches of the Acrania, Cyclostomes, and Selachii (Figure 1.161 h) first develop from their inner or median wall (from the cell-layer that lies directly on the skeletal plate

    The Evolution of Man — Volume 2

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