单项选择题
A．tibial nerve B．common peroneal nerve C．popliteal vein and its tributaries D．popliteal artery and its branches E．deep peroneal nerve
A．anterior longitudinal ligament B．posterior longitudinal ligament C．interspinal ligament D．ligamenta flava E． supraspinal ligament
A．the 2th rib B．the 6th rib C．the 7th rib D．the spine of the 7th thoracic vertebra E．the spine of the 10th thoracic vertebra