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
their cells bodies
into the embryo. The
cells nearby rotate,
pink, orange) see Gilbert, 9e, Fig. 7.8 Bottle cells later respread The
wrong! see Gilbert, 9e, Fig. 7.10 Bottle cells later respread
Bottle cells later
respread to form
part of the roof of
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
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
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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.
- Fall '12