The procedure involved an incision at the temple and surgical dissection of the temporalis muscle.
From the sciencedaily.com
The large muscles on the top of the head, called the masseter and temporalis muscles, are the muscle for chewing.
From the toledoblade.com
The temporalis, masseter, and internal and external pterygoid muscles, which are mainly used for chewing, have a minor effect on expression as well.
From the en.wikipedia.org
The words perpetuus and temporalis distinguish their appointments but not the length of service, the apparent reference to time is accidental.
From the en.wikipedia.org
Paranthropus was more massively built craniodentally and tended to sport gorilla-like sagittal crests on the cranium which anchored massive temporalis muscles of mastication.
From the en.wikipedia.org
In particular, the enlargement of the temporalis and neck muscles is consistent with that required to resist the large tugging forces generated when taking large mouthfuls of fodder from the ground.
From the en.wikipedia.org
More examples
Temporalis muscle: muscle extending from the temporal fossa to the coronoid process of the mandible; acts to raise the mandible and close the jaws
This is a sheet of muscle on the side of the head above the ears. It helps to close the jaws. These strong muscles get enough exercise when we eat. They do not need any specific exercise.
A specific muscle on the head, in the temple area.