Stv2 cameroon online dating
White matter is composed mainly of myelinated axons, and takes its color from the myelin.White matter includes all of the nerves, and much of the interior of the brain and spinal cord.There are, however, a few exceptions to this rule, notably including the part of the forebrain called the basal ganglia Arthropods, such as insects and crustaceans, have a nervous system made up of a series of ganglia, connected by a ventral nerve cord made up of two parallel connectives running along the length of the belly.Typically, each body segment has one ganglion on each side, though some ganglia are fused to form the brain and other large ganglia.In the human brain, it is estimated that the total number of glia roughly equals the number of neurons, although the proportions vary in different brain areas.
There is an anatomical convention that a cluster of neurons in the brain or spinal cord is called a nucleus, whereas a cluster of neurons in the periphery is called a ganglion.The enteric nervous system functions to control the gastrointestinal system.Both autonomic and enteric nervous systems function involuntarily.The head segment contains the brain, also known as the supraesophageal ganglion.In the insect nervous system, the brain is anatomically divided into the protocerebrum, deutocerebrum, and tritocerebrum.
Search for stv2 cameroon online dating:
Nervous tissue first arose in wormlike organisms about 550 to 600 million years ago.