Head Model, 6 part Our most detailed head model! This life-size 6-part head is mounted on a base and features a removable 4-part brain half with arteries. The eyeball with optic nerve is also removable and one side of the high quality model exposes the nose, mouth cavity, pharynx, occiput and skull base. This head model is delivered on a removable base for easy display in a classroom or doctor's office.