1.Exteroception: Sensations perceived by the body, arising from external world and include touch, pressure, vibration, pain, thermal sensation, itch, tickle, etc. •
2.Proprioception: Sensations perceived by the body, generated by the own tissues and include perception of posture, joint position and movement, muscle contraction and stretch. •
3.Interoception: Sensations perceived by the body, arising from internal world and include sensations
from viscera like hunger, thirst, bladder fullness, urge to defecate, etc. general senses consist of a sequence of three neurons that extends from peripheral receptor to the cerebral cortex. These are often referred to as primary, secondary and tertiary neurons or first-order neurons, second-order neurons and thirdorder neurons . Unconscious proprioception and some exteroception going to cerebellum consist of only two neurons, as also those terminating in brainstem.