By D. R. Garrod (auth.)
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The activity of these filopodia can be observed directly in time-lapse films of gastrulation in the sea urchin because the embryos are transparent, enabling one to see inside the blastocoele where the activity takes place. What seems to happen is that filopodia are extended from the mesenchyme cells and adhere to the inner surfaces of filopodium ce 11 B A A ~ A ruffles B B Fig. 5. Diagram to show filopodal movement. The filopodium is extended and attaches to the substratum at B. As the cell moves from A to B, the filopodium shortens.
When the host 1imb limbs acquired motor nerves and functioned moved forward, the transplant would move normally (Fig. ). The brachial region of the backwards, and so on. Although the transcord is that from which motor innervation of planted limb was now on the right hand side of the forelimbs normally comes, so the experthe body and although it moved simultaneously iment suggests that only the appropriate nerves with the host's normal right limb, its movements can innervate the limb muscles: thoracic motor 30 Fig.
Cortical granule ," contents to the outside of the egg into the perivitelline space; that is the spaee between the egg membrane and the surrounding vitelline membrane. It is probable that diseharge of eortieal granules also inereases the surface area of sea urehin eggs . In the newt, membrane folds present before cleavage, persist after cleavage . (bl Fig. 3. Diagram showing how discharge of cortical granules may increase the area of surface membrane. (a) The situation be fore fertilization.