Engines that do not have a water cooling system can not use a heater core; one alternative is to guide air around the (very hot) engine exhaust manifold and then into the vehicle's interior. Temperature control is achieved by mixing with unheated outside air.
1. A widening of the prevertebral soft tissue is often associated with injury to the cervical spine. Injury to the cervical spine may be accompanied by pre and/or paravertebral haematoma, which is radiographically demonstrated as an abnormal increase within the width of the prevertebral space [1] , [2] and [3] .his study was undertaken to explore the diagnostic value of prevertebral soft tissue swelling with special reference to the association of this sign with the presence and degree of cervical spine injuries.
Definition of INTERVERTEBRAL DISK. : any of the tough elastic disks that are interposed between the centra of adjoining vertebrae and that consist of an outer fibrous ring enclosing an inner pulpy nucleus.