a) Anatomy (Bone and Soft Tissue)

Q What are the muscles of mastication?

A: Temporalis

Masseter

Medial and lateral pterygoid

Q What is the synapsid opening

A The opening formed by the zygomatic arch, which the temporalis passes through.

Q What is a synapsid

A: Some classify synapsids as premamalian reptiles, an important step in the evolution to mammals.

Reference:

http://www.amnh.org/our-research/paleontology/collections/fossil-amphibians-reptiles-and-birds/