Anterior limit of infratemporal fossa is:
Lateral pterygoid plate
Maxillary posterior wall
Pterygomaxillary fissure
Mastoid process
Infratemporal fossa is an irregular space found below zygomatic arch.
Boundaries:

Anteriorly : Posterior surface of maxilla.
Medially : Lateral pterygoid plate and pyramidal process of palatine bone.
Laterally : Ramus of mandible.
Superiorly : Infratemporal surface of greater wing of sphenoid.