A person can get information about external world through different kinds of sensations. Such sensations can be felt when sensory nerves related to it may get adequate stimulus. After the stimulation of sensory nerves and their entery into the brain or spinal cord, they are analysed by the centeral nervous system and we feel that special sensation only when the brain translates it. The body is sensitive for the sound, light, smell, pressure, etc. their sensations depend on the special sense organs which are present into different portions of the body.
Nerve fibers are related to special sense organs. Nerve fibers give up their neurolemma and mylein sheath before the termination in the special sense organs. The last portion of each special sense organ is made something special which is called end organ and these end organs are the special organs of sense. There are many sub organs related to each sense organ which transmit stimulus to the end organ. But real stimulus gets completed in the end organ and from there it reaches into the brain where it is analysed and special sense is known.
There are five sense organs in human body by which a person gets information about the external world.
Skin: A person gets the information about touch, pressure, pain, hurt, heat and cold through this sense organ.
Tongue: A person gets information about the taste of any thing through this sense organ.
Nose: This sense makes a person aware about the smell of any thing.
Ears: This sense makes us aware about different kinds of sounds.
Eyes: World is seen through this sense organ named eyed.