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carried from the left to the right side of each cell, the spindles for their first
subdivision appear, and the cleavage takes place in a laeotropic direction (Fig.
13). This cleavage is a very unequal one, the outer products being the small
trochoblasts.
Edwin Grant Conklin,
1899
2
Biological Lectures Delivered at the Marine Biological ...
The next point which requires investigation is the fact that, in the great majority of
cases, the direction of corresponding cleavages is the same, i.e., the second
cleavage is laeotropic and the third dexiotropic, and so on (Fig. 5). Why should
this ...
Marine Biological Laboratory (Woods Hole, Mass.),
1900
3
Contributions from the Zoological Laboratory of the ...
In all cases in which the first cleavage is dexiotropic the pole cells of the
mesoblast arise from the left posterior macromere by laeotropic division (Fig. 4);
where the first cleavage is laeotropic (as in some sinistral gas- teropods) they
arise from ...
4
Contributions from the Zoological Laboratory
22. — -Same egg as fig. 21, seen from vegetative pole. The laeotropic division of
3D, forming 4D and 4d (ME), is completed. Fig. 23. — Animal pole view of egg
containing 41-44 cells, la1-ld1 have divided in a dexiotropic direction the "apicals
" ...
carried from the left to the right side of each cell, the spindles for their first
subdivision appear, and the cleavage takes place in a laeotropic direction (Fig.
13). This cleavage is a very unequal one, the outer products being the small
trochoblasts.
University of Pennsylvania. Zoological Laboratory,
1901
Viewed from the animal pole, the cross furrow has been turned several degrees
in a laeotropic direction. This rotation is obviously a result of the dexiotropic
cleavage of the macromeres. Of course, if we take the small cells at the
vegetative ...
7
Pamphlets on Biology: Kofoid collection
Indeed, they are only a little smaller than the intermediate girdle cells. The next
division in the first quartette is the formation of the rosette by laeotropic divisions (
Fig. 1 30). The four rosette cells are relatively larger than in Arenicola (Fig. 132, cf
.
8
The Early Development of Planorbis ...
Viewed from the animal pole, the cross furrow has been turned several degrees
in a laeotropic direction. This rotation is obviously a result of the dexiotropic
cleavage of the macromeres. Of course, if we take the small cells at the
vegetative ...
Samuel Jackson Holmes,
1900
9
Reproductive Strategies and Developmental Patterns in Annelids
Figure comparing the duel spiral cleavage pattern of the acoel. Nenchildatfuxcti i
A) to that based on quartet spiral cleavage in which the first quartet is generated
in a laeotropic fashion tB). All embryos are viewed from the animal pole. I A) First
...
Adriaan W.C. Dorresteijn, Wilfried Westheide,
1999
10
Morphology, Molecules, Evolution and Phylogeny in Polychaeta ...
The cell material within a quadrant is generated by a series of alternating
dexiotropic and laeotropic spiral cleavages. For example, at third cleavage the
spindles are oriented slightly tilted with respect to the animal-vegetal axis (Fig.
3H).
Thomas Bartolomaeus, Günter Purschke,
2006