“The cranium studied on the recto is in the same section as in the upper drawing of 919057r, with the floor of the cranial cavity tilted a little further towards the viewer. Again, the site of the senso comune is indicated at the intersection of orthogonal axes. The note defines this position in proportional terms:

The confluence of all the senses has below it in a perpendicular line the uvula, where one tastes food, at a distance of two fingers; and it is directly above the windpipe of the lung and the orifice of the heart by a space of one foot. And it has the junction of the bones of the head half a head above it; and in front of it in a horizontal line is the lacrimator of the eye at one-third of a head.“

Via – The Royal Collection Trust