Hox genes are primary regulators of the body plan along the length of the animal; they are expressed in overlapping zones that specify morphological regions of the body, such as cervical, thoracic, lumbar, sacral/pelvic, and caudal mesodermal tissues, where, for instance, a thoracic vertebra would have one kind of shape with associated ribs, while lumbar vertebra would have a different shape and no ribs. ❋ Unknown (2010)
Hydra are wonderful experimental animals in that one can ablate stem cells for a particular tissue type, and still get an animal that develops and lives; do the same thing to a vertebrate, for instance knocking out the mesodermal lineage in the embryo, and you get an aborted blob. ❋ Unknown (2010)
The remaining mesodermal tissue is then consistently shown in the same orange-red ignoring the overlap with the ectodermal derivatives noted above, but only until we get out to the extraembryonic mesoderm, which shows up in yet another, lighter shade of orange. ❋ Unknown (2006)
Although appearing very different, these movements might be related to the invagination of mesodermal and endodermal anlagen, and ventral condensation and extension of the germ band in the Drosophila embryo. ❋ Unknown (1995)
To the right and left of it is a row of mesodermal blocks or somites. ❋ Unknown (1965)
It invaginates altogether as if it were still in its old place, builds up part of the axial organs and completes itself out of the mesodermal environment. ❋ Unknown (1965)
O. Mangold was able to show that mesodermal organs such as notochord, somites and pronephric ducts could arise from presumptive ectoderm by suitable transplantation at the beginning of gastrulation. ❋ Unknown (1965)
At first he made the mistake of supposing that the body-cavity arose from the segmentation-cavity, but in his later paper he rightly surmised that it was formed from the cavities of the "primitive vertebræ," or mesodermal segments. ❋ Unknown (N/A)
Thus in many mammals the mesodermal part of the allantois often appears long before the endodermal part, though this is phylogenetically older. ❋ Unknown (N/A)
About the tenth week the mesodermal tissue beneath these special dental germs becomes differentiated into papillæ; these grow upward, and come in contact with the epithelial cells of the special dental germs, which become folded over them like a hood or cap. ❋ Unknown (1918)
While these changes are going on, a sac is formed around each enamel organ from the surrounding mesodermal tissue. ❋ Unknown (1918)
In the meantime, while these changes have been going on, the dental lamina has been extending backward behind the special dental germ corresponding to the second deciduous molar tooth, and at about the seventeenth week it presents an enlargement, the special dental germ, for the first permanent molar, soon followed by the formation of a papilla in the mesodermal tissue for the same tooth. ❋ Unknown (1918)
About the fourteenth week of embryonic life the dental lamina becomes enclosed in a trough or groove of mesodermal tissue, which at first is common to all the dental germs, but subsequently becomes divided by bony septa into loculi, each loculus containing the special dental germ of a deciduous tooth and its corresponding permanent tooth. ❋ Unknown (1918)
The epidermis and its appendages, consisting of the hairs, nails, sebaceous and sweat glands, are developed from the ectoderm, while the corium or true skin is of mesodermal origin. ❋ Unknown (1918)
The tissue surrounding the original mesodermal core forms fibrous sheaths for the developing bones, i. e., periosteum and perichondrium, which are continued between the ends of the bones over the synovial membrane as the capsules of the joints. ❋ Unknown (1918)
Between the endothelial lining and the outer wall of the heart there exists for a time an intricate trabecular network of mesodermal tissue from which, at a later stage, the musculi papillares, chordæ tendineæ, and trabeculæ are developed. ❋ Unknown (1918)
The extra-embryonic celom is of considerable size, and scattered mesodermal strands are seen stretching between the mesoderm of the yolk-sac and that of the chorion. ❋ Unknown (1918)
While still maintaining a horizontal direction it has two edgesan attached edge, continuous with the epithelium lining the mouth, and a free edge, projecting inward, and imbedded in the mesodermal tissue of the embryonic jaw. ❋ Unknown (1918)
As before stated, the first germs of the dentin are the papillæ, corresponding in number to the teeth, formed from the soft mesodermal tissue which bounds the depressions containing the special enamel germs. ❋ Unknown (1918)
