▁third , ▁fourth ▁and ▁fifth ▁verte bra e ▁also ▁show ▁p neum at op ores ▁but ▁the ▁consecutive ▁series ▁la cks ▁them , ▁which ▁is ▁surprising ▁as ▁it ▁had ▁been ▁assumed ▁the ▁p neum at isation ▁process ▁would ▁have ▁started ▁at ▁the ▁back , ▁working ▁itself ▁forward . ▁Con tr ary ▁to ▁what ▁was ▁stated ▁by ▁the ▁ 1 9 9 8 ▁study , ▁the ▁cer v ical ▁rib s ▁are ▁very ▁el ong ated , ▁with ▁a ▁length ▁of ▁up ▁to ▁three ▁verte br al ▁cent ra . ▁ ▁The ▁verte bra e ▁of ▁the ▁back ▁are ▁not ▁p neum at ised . ▁They ▁are ▁am phi pl at yan ▁with ▁an ▁o val ▁cross - section ▁and ▁bear ▁low ▁sp ines ▁with ▁a ▁hex ag onal ▁profile . ▁Just ▁below ▁the ▁top ▁of ▁the ▁sp ine ▁on ▁the ▁front ▁and ▁back ▁edge ▁a ▁small ▁be ak - sh aped ▁process ▁is ▁present . ▁In ▁ 1 9 9 8 ▁interpreted ▁as ▁a ▁reduced ▁hy pos ph ene - h yp ant rum ▁complex , ▁a ▁system ▁of ▁secondary ▁verte br al ▁joint s ▁shown ▁by ▁many ▁ther op ods , ▁it ▁was ▁by ▁the ▁ 2 0 1 1 ▁study ▁seen ▁as ▁a ▁pair ▁of ▁attachment ▁points ▁for ▁tend ons , ▁as ▁identified ▁in ▁ 2 0 0 6 ▁in ▁Com ps ogn ath us . ▁Exception ally , ▁with ▁the ▁th ir teenth ▁verte bra ▁the ▁two ▁rib ▁joint ▁processes , ▁the ▁par ap oph ysis ▁and ▁the ▁dia p