Supports the structures of the face and forms a protective cavity for the brain.
The skull is a bony structure in the head of most vertebrates (in particular, craniates) that supports the structures of the face and forms a protective cavity for the brain. The skull is composed of two parts: the cranium and the mandible. The skull roof is formed of a series of plate-like bones, including the maxilla, frontals, parietals, and lacrimals, among others. It is overlaying the endocranium, corresponding to the cartilaginous skull in sharks and rays. The skull is the part of the skeleton that covers and protects the brain and other sense organs. The human skull is composed of 22 types of bones. These bones are separated into two categories, the bones the form the cranium and facial bones. The section of the brain that holds the brain is known as the cranium. The cranium is made up of eight flat bones that are connected. The cranium bones form the forehead and eye socket and the back of the skull. The facial bones include fourteen bones, the majority of them symmetrical to give the face symmetry. The facial bones include bones such as the maxilla, which is the upper jaw and the nasal bone. Early separation of the bones provides the fetal skull with the flexibility necessary to pass through the tight confines of the birth canal.... Click to read more below. A collection of 22 bones, the skull protects the all-important brain and supports the other soft tissues of the head. During fetal development, the bones of the skull form within tough, fibrous membranes in a fetus’ head.  Skull is made up of several bones. Bones give structure to our body. Without bones, our body will be a big chunk of jelly. So skull gives shape to our head and also gives us our facial features. Bones that make up the skull, like every other bone in the body, are hard and strong from outside. So they do a vital job of protecting our brain. Our brain is extremely soft and wrinkly. Without this bony structure on the outside, even a tiny bump could hurt the brain the skull. Your 3 pound (1.4 kg) brain needs a home...your skull! Your brain is protected by several bones. There are eight bones that surround your brain: one frontal bone; two parietal bones, two temporal bones, one occipital bone, one sphenoid bone and one ethmoid bone. These eight bones make up the cranium. Another 14 bones in the face make up the entire skull. There are also three small bones in each ear. Also protecting your brain are three layers of tissue called the meninges. A few of the bones have been colored in the diagram below. There is a large opening, called the foramen magnum, located in the back of the occipital bone. This is where the medulla ends and projects out of the skull. Smaller holes in the skull, called foramina, allow nerves and blood vessels to enter and leave the cranium. Skull. The human skull consists of about 22 to 30 single bones which are mostly connected together by ossified joints, so called sutures. The skull is divided into the braincase (cerebral cranium) and the face (visceral cranium). Its main task is the protection of the most important organ in the human body: the brain. The skull base is the caudal boundary of the cerebral cranium. Looking at it from the inside it can be subdivided into the anterior, middle and posterior cranial fossae. The skull base comprises parts of the frontal, ethmoid, sphenoid, occipital and temporal bones. Skull. Protecting our brain is the bone known as the skull. The skull is a special set of bones and plates that when we are born are separated by cartilage, but as we grow the cartilage dissolves away and is replaced by the growing skull bone. Skull symbolism is the attachment of symbolic meaning to the human skull. The most common symbolic use of the skull is as a representation of death and mortality. 
https://en.wikipedia.org/wiki/Skull http://microscopy-uk.org.uk/mag/artnov07macro/structure_of_the_human_skull/ http://www.innerbody.com/image_skelbov/skel06_new_bov.html http://kinooze.com/why-do-we-have-a-skull/ https://faculty.washington.edu/chudler/skull.html https://www.kenhub.com/en/library/anatomy/the-skull http://idahoptv.org/sciencetrek/topics/skeletons/facts.cfm https://en.wikipedia.org/wiki/Human_skull_symbolism
info about what the skull does