Definitions
from The Century Dictionary.
- noun 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
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Examples
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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 Ernst Heinrich Philipp August Haeckel 1876
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The outer covering is the simple cell-layer of the epidermis (E).
The Evolution of Man — Volume 2 Ernst Heinrich Philipp August Haeckel 1876
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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 Ernst Heinrich Philipp August Haeckel 1876
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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 Ernst Heinrich Philipp August Haeckel 1876
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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 Ernst Heinrich Philipp August Haeckel 1876
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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 Ernst Heinrich Philipp August Haeckel 1876
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