TIME SPACE COMPRESSION VS CONVERGENCE PLUS
The IMZ is a ring of several layers of deep cells, plus a superficial epithelium, that lies above and around the VE prior to gastrulation (St 10-). See legend of tissue colors, acronyms and movements at the bottom of the figure. This includes the animal and vegetal poles (AP, VP), the involuting marginal zone (IMZ), the vegetal endoderm (VE), and the morphogenic movements convergent thickening (CT, white arrows), epiboly (E, black arrows within epidermis), vegetal rotation (VR, gray arrows/black arrows within VE), mesendoderm migration (purple arrows), involution (red arrows), and convergent extension (CE, green ( C) and blue ( E) arrows within neural and mesodermal tissues). 10+, 11–11.5) in mid-sagittal cut-aways rotated 45°, within the context of the whole embryo and the other morphogenic movements. ( A) The behavior of the involuting marginal zone (IMZ) in blastopore closure is shown in the pre-gastrula embryo (St 10-) and at subsequent stages of gastrulation (St.
0 kommentar(er)
