<P> Opisthotonus or opisthotonos , from Greek roots , ὄπισθεν , opisthen meaning `` behind '' and τόνος tonos meaning `` tension '' , is a state of severe hyperextension and spasticity in which an individual 's head , neck and spinal column enter into a complete `` bridging '' or `` arching '' position . This abnormal posturing is an extrapyramidal effect and is caused by spasm of the axial muscles along the spinal column . </P>
<P> Opisthotonus or opisthotonos , from Greek roots , ὄπισθεν , opisthen meaning `` behind '' and τόνος tonos meaning `` tension '' , is a state of severe hyperextension and spasticity in which an individual 's head , neck and spinal column enter into a complete `` bridging '' or `` arching '' position . This abnormal posturing is an extrapyramidal effect and is caused by spasm of the axial muscles along the spinal column . </P>
the medical term opisthotonos ( backward bending tone ) means
the medical term opisthotonos ( backward bending tone ) means
a state of severe hyperextension and spasticity in which an individual 's head , neck and spinal column enter into a complete `` bridging '' or `` arching '' position
a state of severe hyperextension and spasticity in which an individual 's head , neck and spinal column enter into a complete `` bridging '' or `` arching '' position