THE HEAD CAN ROTATE AT THE JOINT BETWEEN THE FIRST AND SECOND CERVICAL VERTEBRAE (THE ATLAS-AXIS JOINT) , WHICH CONSISTS OF AN ADJUSTER ASSEMBLY (14 AND 18) , A SPACER (16) AND A POLYAMIDE BLOCK (10).
Glava se lahko zavrti okoli zgiba med prvim in drugim vratnim vretencem (zgib atlas osi), ki vsebuje napenjalec (14 in 18), cevni distančnik (16) in poliamidni blok (10).