Practice Essentials. Perinatal asphyxia, more appropriately known as hypoxic-ischemic encephalopathy (HIE), is characterized by clinical and laboratory evidence of acute or subacute brain injury due to asphyxia. The primary causes of this condition are systemic hypoxemia and/or reduced cerebral blood flow (CBF) (see the image below).
Chondrichthyes (/kÉnËdrÉªkÎ¸É¨.iËz/ ; from Greek ÏÎ¿Î½Î´Ï- chondr- 'cartilage', á¼°ÏÎ¸ÏÏ ichthys 'fish') is a class that contains the cartilaginous fishes: they are jawed vertebrates with paired fins, paired nares, scales, a heart with its chambers in series, and skeletons made of cartilage rather than bone.he skeleton is cartilaginous. The notochord, which is present in the young, is gradually replaced by cartilage. Chondrichthyes also lack ribs, so if they leave water, the larger species' own body weight would crush their internal organs long before they would suffocate.
Osteichthyes are a very diverse group of bony fish. They are Ectothermic, which means they depend on the surrounding environment for their body temperatures. Osteichthyes live in all types of fresh and salt waters.steichthyes (Bony Fish) are the most species-rich and morphologically diverse lineage of all vertebrates. 1  brain. 2  spinal cord. 3  cranial nerves. 4  spinal nerves. 5  sensory organs 6  -. eyes-good eyesight. 7  no eyelids, thus permitting a maximum amount of. 8  light. 9  ears-no external opening.