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RE: anatomical questions (mandibule of a basal synapsid)



Jeff Leach wrote-

1) is the retroarticular process the ventral process of the articular (as labeled in the figure)? The shape and position differs from therapsids so I am somewhat unsure.

No, the retroarticular process is the part posterior to the mandibular articulation (X and Y).


2) is the 'cotylus for the quadrate' the posterodorsal corner of the articular (about where 'art' points to in the medial view of the mandibule?)

No, the cotylus for the quadrate is X and Y. A cotylus is just an articulating concavity, and as you deduced in question 3, those cotyla are where the quadrate articulates with the mandible.


3) The two fossa labeled X and Y, anyone know if they have names? They look like the articulating surfaces for the quadrate.

See above.

4) the article refers to the 'external mandibular foramen', 'inframandibular foramen' and 'meckelian fenestra'. The last two terms are equivalent, at least I think so. Have I labeled the mandibular foramen and inframandibular foramen correctly.

The external mandibular foramen (or fenestra) is the dark gray and white hole in lateral view. I would agree the other two terms are probably equivalent, and are the dark gray hole in medial view.


5) Is the 'coronoid eminence', the portion of the posterior coronoid visible in lateral view or does it continue posteriorly along the surangular?

I'd say the second possibility. Oviraptorids have a coronoid eminence on their surangular that their coronoid (which is barely present) doesn't even participate in.


Mickey Mortimer