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The temporalis muscle runs from the jaw up under the zygomatic arch and is relevant to the study of:

a) Primate locomotion
b) Human speech
c) Tool use
d) Cranial anatomy

Answer :

Final answer:

The temporalis muscle, situated within the temporal fossa and infratemporal fossa on the lateral side of the brain case, plays a critical role in mastication, or chewing, by aiding in the elevation and closure of the jaw. It's most directly relevant to the study of cranial anatomy.

Explanation:

The temporalis muscle is an important part of human cranial anatomy. It runs from the jaw up under the zygomatic arch, within spaces called the temporal fossa and infratemporal fossa, which are located on the lateral side of the brain case. These spaces contain muscles that are essential for the action of mastication or chewing.

The temporalis is responsible, in unison with the masseter muscle, for elevating and closing the jaw to break food down into digestible pieces. It retracts the mandible, enabling effective chewing and the movement of food within the mouth. Thus, the temporalis muscle is most directly relevant to the study of d) Cranial anatomy.

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