Brains II

Skull dome removd showing the right cerebral hemisphere. 2 external planes: 1. eye pupils to ear canals 2. tip of nose to ear canals. Behind ear (mastoid) SCM = sterno cleido mastoid muscle. C1 atlas C2 odontoid

Landmarks externally help visualize the inner relationships. A rod from ear canal to opposite ear canal is not obvious in this side view but seen in some that follow. Here C1 & C2 are seen poking out just behind the upper STM which runs from the sternum to the mastoid emenence just behind & below the ear. Notice how a level plane from nose tip to ear canal passes just above the nasal/oral palatte.