SPINAL ANAESTHESIA: The
anaesthetic is injected into the fluid surrounding the spinal cord in the lower back. This numbs the entire lower half of the body or just one side depending upon the
position given to the body, immediately after the injection.
EPIDURAL ANAESTHESIA: This is a
form of anaesthesia practiced in Obstetrics or for conducting painless deliveries. Here
the anaesthetic is injected into the space just outside the spinal cord. Though blocking
the pain signals from the lower half of the body, one is able to move the limbs and feel
sensations such as pressure.
NERVE BLOCKS: Here the anaesthetic is injected into a cluster of nerves to just numb a limb or a part of the limb. Like surgery on the hand or the finger.
TOPICAL ANAESTHESIA: The local
anaesthetic is applied to the eyes, throat, skin etc., as a spray, drops, cream or
ointment. One feels numbness in the affected part almost immediately.