A neuron has a main cell called _______.

Central canal of spinal cord is surrounded by an H-shaped area called _____

_______ connect the sense organs to the brain.

Reflex actions are _____ actions.

 Stimuli that arise within the organism are called ______.

 Stimuli that are received by an organism from the outside world are called _________.

Central nervous system consists of _____ and ________.

The longest fibre of a neuron is called _______.

The pathway of nerve impulse of a reflex action.

 _____ is the control centre of the nervous system.