The skull cap and jaw are removable, the rest of the skull is medially sectioned into two halves. Perpendicular plate of ethmoid and vomer fold back to show lateral nose wall and sphenoid sinus. The left temporal bone is removable and the maxilla and mandible open to reveal alveolar vessels and nerves. The right temporal bone shows sigmoid sinus, canalis facialis and semicircular canals. A flap opens to expose roots of premolars and molars, all the teeth are removable. The skull is painted to show sinuses, arteries and cranial nerves.