Head and neck surgery

Head: The upper part of the human body, or the front or upper part of the body of an animal, typically separated from the rest of the body by a neck, and containing the brain, mouth, and sense organs.

https://meshb.nlm.nih.gov/record/ui?ui=D006257

Also, skull, facial bones, injuries: craniocerebral trauma

Neck: The part of a human or animal body connecting the head to the rest of the body.

https://meshb.nlm.nih.gov/record/ui?ui=D009333

Also, cervical vertebrae, neck muscles