The muscle indicated is the styloglossus muscle .
The styloglossus muscles is one of three styloid muscles. The three styloid muscles are:
Origin: Styloid process of temporal bone
Insertion: lateral aspect of tongue
Innervation: Hypoglossal nerve (cranial nerve 12)
Action: Elevation and retraction of the tongue
The styloid muscle is one of several extrinsic muscles of the tongue.
Learn all about the extrinsic muscle of the tongue in this anatomy tutorial.