Courtesy ray keller gastrulation involves region

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Unformatted text preview: courtesy Ray Keller Gastrulation involves region-specific behaviors Adapted from Gilbert 9e, Fig. 7.10 Gastrulation involves region-specific behaviors Bottle cells: Invagination by apical constriction, then respreading courtesy Ray Keller Bottle cells - cutaway view courtesy Ray Keller Bottle cells - surface view Bottle cells constrict their apical ends (on the surface). They constrict down to small points in some cases. courtesy Ray Keller Bottle cells undergo apical constriction Activated myosin and actin are found at apical surfaces as bottle cells constrict. Lee and Harland (2007). Dev. Bio. 311, 40–52 The blastopore forms where bottle cell constrict see Gilbert, 9e, Fig. 7.8 Bottle cells help rotate the blastopore lip Bottle cells constrict, pushing their cells bodies into the embryo. The cells nearby rotate, orienting the mesoderm (red, pink, orange) see Gilbert, 9e, Fig. 7.8 Bottle cells later respread The book is wrong! see Gilbert, 9e, Fig. 7.10 Bottle cells later respread Bottle cells later respread to form part of the roof of the archenteron, as mesodermal cells involute. see Gilbert, 9e, Fig. 7.10 Gastrulation involves region-specific behaviors Adapted from Gilbert 9e, Fig. 7.10 Gastrulation involves region-specific behaviors Non-involuting marginal zone: radial intercalation and convergent extension Radial intercalation thins the NIMZ. Later, dorsal NIMZ undergoes convergent extension Dorsal NIMZ becomes neural ectoderm Gilbert 9e, Fig. 7.10; Wolpert et al 2e, Fig. 8.26 Ectodermal movements dorsal AP ventral anterior NIMZ IMZ courtesy Ray Keller VP BCs posterior NIMZ = Non-involuting marginal zone. Dorsal NIMZ becomes neural ectoderm; ventral NIMZ becomes epidermis. Gastrulation involves region-specific behaviors Involuting marginal zone: convergent extension The dorsal IMZ undergoes dramatic convergent extension, resulting in explosive elongation. IMZ forms mesoderm. Gilbert 9e, Fig. 7.10; Wolpert et al 2e, Fig. 8.26 Deep cell movements dorsal dors...
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This note was uploaded on 11/08/2013 for the course ZOOLOGY 470 taught by Professor Hardin during the Fall '12 term at University of Wisconsin.

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