Itās know as referred sensation/pain. The pain receptors (nociceptors) of the skin of your left ankle and the the nociceptors of your āstomachā are sharing a single
projection neurone up the āsubstantial gelatinosa of Rolandoā (Rexed layer II) to the somatosensory cortex of your brain. As a consequence of this sharing of this projection neurone, you brain canāt tell if the action potentials are coming from the ankle or the stomach and has to guess and in you case says ā
stomachā! Itās usually the other way around and organ pain is often referred to the surface of the body (myocardial infarction pain is referred to the centre of the chest, down the left arm and sometimes up the throat/neck.)
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If you want to know why, itās due to the original origins of various tissues until they were rearranged during embryological development.
Your pain referral is a bit ānon-standardā but thatās not unusual. If I tweak an area of skin on my lower back i get a sharp pain in the thenar webspace (skin between base of thumb and base of index finger)
The Thenar webspace in Japanese is called āboshi nitenkinā
Ahhhh that felt like my good olā days of teaching neuroscience and anatomy! Any questions? This
will be on the exam.