types of jaw bones

Question 1

synapsid time period and bones

Answer 1

300 mya, squamosal, quadrate, and articular dentrary

Question 2

therapsid time and bones

Answer 2

280 mya, squamosal/quadrant (reduction), forms hinge where articular bone can articulate to move jaw

Question 3

early cynodonts time and bones

Answer 3

260 mya, still see articulation b/w quadrant and articular bone

Question 4

later cynodonts time and bones

Answer 4

220 mya, dentary bone increasing in size, squamosal (reduction), quadrant/articular bones are completely lost

Question 5

where do mammals have articulation?

Answer 5

b/w dentary and squamosal bone