The lateral pterygoid muscle is one of the muscles used to open the jaw.

The medial pterygoid muscle is one of the important muscles for moving the jaw.

He did a somersault in the park.

He goes to the gym every day to train his biceps brachii muscle.

This ancient proverb, 'know the other side and yourself, and you will not be in danger in a hundred battles', teaches us the importance of understanding ourselves and others.

He injured his extensor pollicis longus.

He underwent surgery due to an injury to his extensor pollicis brevis.

My flexor pollicis brevis hurts.

He is doing special exercises to strengthen his flexor pollicis longus.

He is doing special exercises to strengthen his dorsal interosseus muscle.