EVERYDAY SCIENCE

Detailed explanation-1: -The nervous system includes the brain, spinal cord, and a complex network of nerves. This system sends messages back and forth between the brain and the body. The brain is what controls all the body’s functions.

Detailed explanation-2: -Each bundle of nerve fibers is called a fasciculus and is surrounded by a layer of connective tissue called the perineurium. Within the fasciculus, each individual nerve fiber, with its myelin and neurilemma, is surrounded by connective tissue called the endoneurium.

Detailed explanation-3: -Nerve. A nerve is an enclosed bundle of axons which carries information to and from the central nervous system. Many axons are enclosed in a common layer of connective tissue along with few blood vessels. Based on the function, nerves are of three types: Sensory, Motor and Mixed.

Detailed explanation-4: -Motor neurons of the spinal cord are part of the central nervous system (CNS) and connect to muscles, glands and organs throughout the body. These neurons transmit impulses from the spinal cord to skeletal and smooth muscles (such as those in your stomach), and so directly control all of our muscle movements.

Detailed explanation-5: -A bundle of axons is referred to as a tract in the CNS and as a nerve in the PNS. Whereas nuclei and ganglia are specifically in the central or peripheral divisions, axons can cross the boundary between the two. A single axon can be part of a nerve and a tract.