The rectus capitis lateralis muscle is part of the neck muscles, and it helps to move the head sideways.

He is doing a special exercise to train his occipitofrontalis muscle.

He is doing a special exercise to strengthen his temporoparietalis muscle.

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

I go to the gym every day to build my muscles.

This river is three long.

The rectus capitis posterior major muscle is a part of the neck muscles, and it helps in the action of pulling the head backwards.

The rectus capitis posterior minor muscle is a part of the neck muscles, and it helps tilt the head backwards.

He likes to take a walk in the park at dusk.

You need to use your head to solve this problem.