A) Quadrate - Ectopterygoid - Pterygoid - Maxilla - Squamosal
B) Quadrate - Squamosal - Pterygoid - Ectopterygoid - Maxilla
C) Maxilla - Ectopterygoid - Pterygoid - Quadrate - Squamosal
D) Maxilla - Pterygoid - Ectopterygoid - Quadrate - Squamosal
Correct Answer: B
Solution :
At the time of biting of a snake, mouth opens and lower end of quadrate thrush forward. This pushes forward the squamosal bones. Due to this, pterygoid bone moves forward. The forward pull of pterygoid, in turn, pushes the ectopterygoids upwards. This causes the maxilla bearing fang to rotate through \[90{}^\circ \] at the hinge joint with lacrimal.
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