What is the Meaning of vertebrates | Definition and Concepts

At the behest of Zoology, vertebrates, are animals that have a skeleton with spine, skull and central nervous system composed by spinal cord and brain. Vertebrates or vertebrata are part of the edge of the chordates, which are those animals that are distinguished by the presence of a dorsal cord or notochord. Approximately, it is estimated that they there are between 50 and 61 thousand species of chordates, currently.
Vertebrate animal has had the ability to adapt to different media which proposes the life in this world, even, there are many that have evolved in the sea and then passed to the terrestrial sphere without problems.
The body of vertebrates it is divided into three areas: head, trunk (Excel tips, which are pairs with the exception of Lampreys), which in turn is divided into thorax and abdomen and tail.
It can be distinguished in the case of aquatic vertebrates have a Gill breathing apparatus, in both, land vertebrates have a pulmonary respiratory.
Another salient feature of vertebrates is the integument, which normally stands as the largest organic system of the animal, covering it completely and protecting it from the environment; tegument form it three layers: epidermis, dermis and hypodermis.
On the other hand, the skin of vertebrates generates epidermal formations, such as: sebaceous glands, faneras, Mammary or sweat, and dermal formations, such as: the scales of the fish, the bony plates of the shells of turtles, among others.
Meanwhile, this type of animal endocrine system is controlled by the hypothalamus and the pituitary gland.
The vertebrate reproduction is sexual, except in some fish suffering from Hermaphroditism; mammals have a greater complexity, since in them the embryos gestate inside the mother receiving food through the placenta.
Its origin goes back to the Cambrian explosion, at the beginning of the Paleozoic period.
Another recurrent use of the word vertebrate allows you to refer to that divide, structured.