how does a local anaesthetic work, and why is possible to still feel pressure in that anaesthetised area?
In: Biology
Local anesthetics enter nerves and block a sodium channel that is needed for those nerves fire. The sequence of loss of is pain -> temperature -> touch -> deep pressure.
Pressure is sensed by different receptors than pain. Or touch. Or heat. Local infiltration anesthesia turns off the pain receptors.
I remember being at a dentist’s and getting an upper tooth done, when I got an itch in the upper lip. I touched it and didn’t feel the tough so I couldn’t scratch it – but I did feel the pressure, which made the itch worse xD
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