Question

reflex action happens without the involvement of brain,then how the information will process?

Answer 1

Reflex action is controlled by the spinal cord and it is the main part of the spinal nervous system .... the spinal cord is connected with foramen magnum ( a part of medulla oblongta ) the path of Reflex action is as follows - Receptor ... sensory nerves ... spinal cord ... association nerves ... motor nerves ... effector
Note that there are two parts of nervous system Cranial ( connected to brain ) and Spinal ( connected with the Spinal cord ) So when we touch a hot vessel we remove our hand on the order of Spinal cord ..