Main Muscles of the Head and Neck (preview) - Human Anatomy | Kenhub
Main nerves of the head and neck (preview) - Human Anatomy | Kenhub
Bones of the head and neck: skull and cervical spine (preview) - Human Anatomy | Kenhub
THE SKULL ANATOMY SONG
Regions of the head and neck (preview) - Human Anatomy | Kenhub
A head is the part of an organism which usually includes the eyes, ears, nose, and mouth, each of which aid in various sensory functions such as sight, hearing, smell, and taste, respectively. Some very simple animals may not have a head, but many bilaterally symmetric forms do, regardless of size. Heads develop in animals by an evolutionary trend known as cephalization. In bilaterally symmetrical animals, nervous tissues concentrate at the anterior region, forming structures responsible for information processing. Through biological evolution, sense organs and feeding structures also concentrate into the anterior region; these collectively form the head.