 The axis is pneumatised as a pneumatopore, an opening through which a diverticulum of the air sack of the neck base could reach its hollow interior, is visible on its side.The third, fourth and fifth vertebrae also show pneumatopores but the consecutive series lacks them, which is surprising as it had been assumed the pneumatisation process would have started at the back, working itself forward.Contrary to what was stated by the 1998 study, the cervical ribs are very elongated, with a length of up to three vertebral centra.