The area inside the skull also receives blood supply from the vertebral arteries, which travel up through the cervical vertebrae.

Modern texts are in agreement about which areas of the skin are served by which nerves, but there are minor variations in some of the details.

The borders designated by diagrams in the 1918 edition of Gray's Anatomy are similar but not identical to those generally accepted today.

Human infants are biologically programmed to recognize subtle differences in anthropomorphic facial features.

[3] Ancient Greeks had a method for evaluating sexual attractiveness based on the Golden ratio, part of which included measurements of the head.

[5] Headpieces can signify status, origin, religious/spiritual beliefs, social grouping, team affiliation, occupation, or fashion choices.

For many centuries, women in Europe, the Middle East, and South Asia have covered their head hair as a sign of modesty.

In addition, a number of religions require men to wear specific head clothing—such as the Islamic taqiyah, Jewish yarmulke, or the Sikh turban.

Reference charts for adult head circumference also generally feature homogeneous samples and fail to take height and weight into account.

[7][dubious – discuss] A British study by Newcastle University showed an average size of 57.2 cm for males and 55.2 cm for females with average size varying proportionally with height [8] Macrocephaly can be an indicator of increased risk for some types of cancer in individuals who carry the genetic mutation that causes Cowden syndrome.