Out of curiosity, he stuck his head into the bear's den.

The abovementioned item has already sold out.

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

This river is three long.

He was so relaxed that his hands were behind his back.

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.

You need to use your head to solve this problem.

A statue of the head of the legendary sea turtle, called 'Aoto', stands in the center of the town.

The cephalothorax of a spider is the part where the head and chest are integrated.