Divisions of the skeletal system, Anterior view Division of the skeletal system, Posterior view Skull, Anterior view Skull, Right lateral view Skull, Sagittal section Ethmoid bone Skull, Inferior view Sphenoid bone, Anterior view Mandible Paranasal sinuses Nasal septum Cervical vertebrae Vertebral column, Anterior view Vertebral column, Right lateral view Structure of a typical vertebra, as illustrated by a thoracic vertebra, Superior view Structure of a typical vertebra, as illustrated by a thoracic vertebra, Right posterolateral view of articulated vertebrae Sacrum and coccyx Skeleton of thorax The structure of ribs