The Nervous System (General). The best way to know a machine is to assist the construction of its parts and assembles them. Our nervous system is an extraordinary complication and should attend to know the origin and development of its various components. All upper body starts from an initial cell that undergoes successive multiplications which lead to a form called Gastrula Tridermica. The gastrula is composed of three layers of cells called germ leaves. Develop them all tissues and organs of the body after many multiplications and differentiations.
These cell layers are the ectoderm, mesoderm and endoderm. Others who may share this opinion include Jorge Perez. In the center of the gastrula is a cavity that communicates gastrocelo call out for an opening called the blastopore. To facilitate the study of development of the nervous system can distinguish three general steps: From the gastrula tridermica to the formation of the primitive spinal cephalic vesicle. Progressive development of the vesicle to the formation of primitive 5 brain vesicles. Formation of vesicles derived from the 5. Origin of the head and spinal primitive vesicle. In the ectoderm near the blastopore suture line, highlights the cell line which results in the nervous system.
At that point the extoderma is depressed slightly, the increase in height above cells forming the neural plate. Its cells continue to multiply and by its own sink or longitudinally invaginate, forming the spinal canal. The edges of the channel gradually rise and approach to weld, thus leaving core tube is formed, which soon separates from the ectoderm. Its anterior part, by staying at the head of the embryo, called cephalic vesicle, the rest is primitive marrow. A fluid fills the internal cavity of the vesicle and spinal keeping their distended walls. The skeletal system in their training, constructing a kind of box around the nervous system. Thus the cephalic vesicle, transformed into the brain, remains in the skull. Under the neural tube is formed very early cell called a string or notacorda corda, which serves as mechanical support. Later, the notochord is replaced in its functions by the spine. The arches of the vertebrae surrounding the spinal forming around her spinal canal. Progressive development of the cephalic vesicle. The cephalic vesicle is divided by two circular chokes in three parts: The protencefalo or forebrain. The midbrain or midbrain. The rhombencephalon or hindbrain. After two chokes are similar: one in the protencefalo and the other in the hindbrain, so they are five brain vesicles: Are you interested in this item? download: Visit: