Structure [edit]. Nervous tissue is composed of neurons, also called nerve cells, and neuroglial cells. Typically, nervous tissue is categorized into four types of tissue. In the central nervous system (CNS), the tissue types found are grey matter and white matter.ells of nervous tissue. Nervous tissue is the main component of the two parts of the nervous system; the brain and spinal cord of the central nervous system (CNS), and the branching peripheral nerves of the peripheral nervous system (PNS), which regulates and controls bodily functions and activity.
(April 2012). A (geographical) meridian (or line of longitude) is the half of an imaginary great circle on the Earth's surface, terminated by the North Pole and the South Pole, connecting points of equal longitude. The position of a point along the meridian is given by its latitude. Each meridian is perpendicular to all circles of latitude. Each is also the same length, being half of a great circle on the Earth's surface and therefore measuring 20,003.93 km (12,429.9 miles).
The world is divided into four hemispheres based on lines of latitude and longitude. The equator is an imaginary line that is equidistant from the North and South Poles. This line falls at zero degrees latitude. The part of the Earth that is north of the equator is known as the Northern Hemisphere. The part of the Earth that is south of the equator is known as the Southern Hemisphere. The Western and Eastern Hemisphere are divided by zero degrees longitude which is known as the Prime Meridian.