Firstly, when the skin is touched, merkels tactile disks associated with slow adapting receptors are stimulated. These mediate light touch sensations which project centrally via the spino-thalamic tracts and the dorsal column medial lemniscus (DCML) pathway. This neuro-pathway is directly associated with the Post Central Gyrus.
Secondly, when the skin is touched (i.e.: on the patients cranium) there are receptors stimulated that project sensation via the DCML to the post-central gyrus.
Thirdly, pacinian corpuscles found in the dermis of the skin respond to contact and pressure. Again this sensation is mediated via the DCML to the post central gyrus. The key function of the DCML is to recognise form by touch (sterognosis) and recognise the position of body parts in space (statognosis). These both relate to the Post Central Gyrus, making it the message and dispatch centre of the brain.