Structure and Composition
- The human head consists of a fleshy outer portion and a bony skull.
- The brain is enclosed within the skull, which is supported by the seven cervical vertebrae.
- There are 22 bones in the human head.
- The head typically weighs between 2.3 and 5 kilograms.
- The face contains the eyes, nose, mouth, cheeks, and ears.

Blood and Nerve Supply
- The head receives blood supply from the internal and external carotid arteries.
- The external carotid artery supplies the area outside the skull.
- The internal carotid artery supplies the area inside the skull.
- The vertebral arteries also provide blood supply to the area inside the skull.
- The cervical vertebrae support the blood supply to the head.
- The head is primarily controlled by the twelve pairs of cranial nerves.
- The trigeminal nerve provides sensation to the face.
- The cervical nerves provide sensation to other parts of the head.
- The distribution of nerves on the skin of the head has some minor variations.
- The head is innervated by the ophthalmic, maxillary, mandibular, cervical plexus, and dorsal rami of cervical nerves.

Function
- The head contains sensory organs such as the eyes, ears, nose, and tongue.
- These organs function as a processing center for the body by relaying sensory information to the brain.
- The head houses the brain, which plays a crucial role in processing information.
- The central nerve cluster in the head allows humans to process information faster.
- The function of the head is essential for various cognitive processes and overall body coordination.

Society and Culture
- The front of the head, particularly the face, is the main distinguishing feature between individuals.
- Human brains are predisposed to recognize and differentiate between faces.
- Depictions of bigger heads in cartoons symbolize greater intelligence.
- The head is a source of metaphors and metonymies in human language.
- Headhunting, the practice of preserving a person's head after killing them, has been practiced across different cultures and regions.

Measurements
- Biocular breadth: Distance from outer corners of the eyes (right and left ectocanthi)
- Bitragion breadth: Breadth of the head from right tragion to left tragion (tragion is the cartilaginous notch at the front of the ear)
- Glabella to back of head: Horizontal distance from most anterior point of the forehead between the brow-ridges (glabella) to the back of the head
- Menton to back of head: Horizontal distance from tip of the chin (menton) to the back of the head
- Sellion to top of head: Vertical distance from nasal root depression between the eyes (sellion) to the level of the top of the head