Notochord is a View Solution In chordates the notochord is View Solution Knowledge Check In some chrodates, the notochord is modified as the vertebral column. Such animals are called vertebrates which one of the following statements make sence. AAll chordates are vartebrates but all vertebrates...
The notochord is an evolutionary novelty in vertebrates that functions as an important signaling center during development. Notochord ablation in chicken has demonstrated that it is crucial for pancreas development; however, the molecular mechanism has not been fully described. Here, we show that in ...
Vertebrates belong to the group of chordates characterized by a dorsal neural tube and an anteroposterior axis, the notochord. They are the only chordates to possess an embryonic and pluripotent structure associated with their neural primordium, the neural crest (NC). The NC is at the origin of...
The basic embryology of skeletal muscle formation in vertebrates: the avian model. Semin Dev Biol 1992; 3: 217–227. Google Scholar Johnston MC, Noden DM, Hazelton RD, et al. Origins of avian ocular and periocular tissues. Exp Eye Res 1979; 19: 27–43. Article Google Scholar Gear...
Mammals are any vertebrates within the class Mammalia, a clade of endothermic amniotes distinguished from reptiles (including birds) by the possession of a neocortex (a region of the brain), hair, three middle ear bones and mammary glands. Females of all mammal species nurse their young with mi...
The mechanism by which the signal is transduced from PTC to SMO is unclear. Strikingly, in vertebrates, but not Drosophila melanogaster, signal transduction requires the primary cilia of cells, identifying a function for this previously enigmatic organelle. Intracellularly, signalling involves Suppressor ...
Chondroitin sulfates have been implicated in the promotion and in the inhibition of axon growth. In the zebrafish embryo, chondroitin sulfates are present at the interface of the somites and the notochord where spinal motor axons extend ventrally to establish the midsegmental ventral motor nerves. ...
Myogenic cells in the body of vertebrates derive from the dorsal somite, the dermomyotome, where multipotent cells are present. Regulation of cell fate choice is discussed, as is that of progenitor cell self-renewal once cells have entered the myogenic programme. Ongoing research on the formation...
K. Combinatorial activities of Smad2 and Smad3 regulate mesoderm formation and patterning in the mouse embryo. Development 131, 1717–1728 (2004). Article CAS Google Scholar Juan, H. & Hamada, H. Roles of nodal-lefty regulatory loops in embryonic patterning of vertebrates. Genes Cells 6, ...
Genomic analysis has upended chordate phylogeny, placing the tunicates as the sister group to the vertebrates. This taxonomic rearrangement raises questions about the emergence of a tunicate/vertebrate ancestor. Characterization of developmental genes un