He reached up and touched the back of his head.

Tom reached across the table and touched the back of her hand.

She reached across the table and touched the back of his hand.

He felt the flat of her hand touch his back.

She reached over slowly and touched the back of his hand.

Once a horse that would not let anyone even touch his back was brought to him.

She knew that no one had touched the back of her neck.

I felt his fingers touch the back of my neck.

I touched the back of my head as it began to hurt.

He touched the back of his hand to one cheek.