Answer
Intrinsic muscles of a structure are contained wholly within an area or organ-- with its origin and insertion within the area. Extrinsic muscles have their origins outside the relevant organ or area in/on which they act .
Work Step by Step
Extrinsic tongue muscles : Genioglossus : has its origin on the hyoid bone
Hyoglossus: has is origin on superior mental spine of the mandible
Intrinsic muscles of the foot:
Extensor digitorum brevis
Flexor digiti minimi brevis
Intrinsic muscles of the hand
Opponens digiti minimi
Palmar interosseous
Extrinsic muscles of the hand
Flexor carpi radialis
Palmaris longus
