Assertion: snake's muscle | /r/HasProperty | set in action
Facets:
value: by the opening of the mouth
type: MANNER
Source sentences:
text: By means of the movable maxillary bone hinged to the prefrontal bone and connected with the transverse bone, which is pushed forward by muscles set in action by the opening of the mouth, the fang is erected and the venom discharged through the distal orifice.