The pathogenesis of HIE in the newborn period involves the same key players that are also present in adults, namely energy crisis from hypoxia-ischemia, lactic acidosis, excitotoxicity, and free radicals, but there are some important modifiers, which account for different patterns of pathology in newborn babies.
Chordates (phylum Chordata) are a group of animals that includes all the vertebrates (subphylum Vertebrata), as well as two subphylum of invertebrates, the Urochordata (tunicates) and the Cephalochordata (lancelets).lso, the relationships of some chordate groups are not very well understood. 1  Phylum Chordata. 2  Subphylum Urochordata (Tunicates). 3  Subphylum Cephalochordata (Lancelets). 4  Class Myxini or Hyperotreti (hagfish). 5  Subphylum Vertebrata (Vertebrates-animals with backbones). 6  Class Conodonta (Conodonts).
Phylum Chordata. Latin chorda, cord. Members of this phylum, our own, are the best known of all the animals. In fact, in the minds of many people, chordate is synonymous with animal.All mammals, birds, amphibians, reptiles, and fish (that is, the vertebrates), along with several obscure groups of animals (including some invertebrates), belong to this phylum.hylum Chordata. Latin chorda, cord. Members of this phylum, our own, are the best known of all the animals. In fact, in the minds of many people, chordate is synonymous with animal.