Medically reviewed by Seunggu Han, M.D. — composed by Jill Seladi-Schulman, Ph.D. — updated on may 24, 2018

What room cranial bones?

Your skull provides structure to her head and face while also protecting your brain. The skeletal in your skull deserve to be separated into the cranial bones, which type your cranium, and facial bones, which comprise your face.

You are watching: The extra bones that sometimes develop between the flat bones of the skull are called

There are several varieties of skeletal within her body, including:

long bonesshort bonesflat bonesirregular bonessesamoid bones

There are two varieties in your cranium:

Irregular bones. These room bones with complex shapes the don’t fit into any type of of the other categories.

There are eight cranial bones, each through a distinctive shape:

Frontal bone. This is the flat bone that makes up your forehead. It also forms the upper portion of your eye sockets.Parietal bones. This a pair of level bones situated on either side of her head, behind the frontal bone.Temporal bones. This is a pair of rarely often, rarely bones located under each of the parietal bones.Occipital bone. This is a level bone located in the really back of her skull. It has actually an opened that enables your spinal cord to affix to her brain. Sphenoid bone. This is an rarely often, rarely bone that sits listed below the frontal bone. The spans the broad of her skull and forms a large part of the basic of your skull. Ethmoid bone. This is an rarely often rare bone situated in front of the sphenoid bone. It provides up part of her nasal cavity.

Your cranial skeleton are organized together by unique joints referred to as sutures, which room made of thick connective tissue. They’re irregularly shaped, allowing them come tightly join all the uniquely shame cranial bones. The sutures don’t fuse until adulthood, which permits your mind to proceed growing during childhood and adolescence.

diagram of cranial bones

Explore the interaction 3-D diagram below to learn much more about the cranial bones.

Cranial bone conditions

Several injuries and health conditions can affect your cranial bones, including fractures and also congenital conditions.


A fracture describes any type of break in a bone. There space several types of skull fracture that can influence cranial bones, such as:

Depressed. This refers to a fracture that makes part of her skull show up sunken.Linear. A linear fracture in a cranial bone way there’s a break in the bone, but the bone itself there is no moved.Basilar. This form involves a break in one of the bones near the base of her skull, such as the sphenoid bone. This is a serious condition requiring instant treatment.Diastatic. A diastatic fracture occurs along one of the sutures of her skull, making it wider than usual. It’s generally seen in infants.

In countless cases, skull fractures aren’t together painful together they sound, and they frequently heal ~ above their own without surgery. However, an ext severe fractures may require surgery.


Some babies are born through a problem called craniosynostosis, which involves the premature birth closing the skull sutures. This leader to an abnormally shaped skull and can sometimes influence facial features.

There are several types of craniosynostosis, depending upon the sutures castle affect:

Bicoronal synostosis. babies with this kind may have a flattened and also elevated forehead.Coronal synostosis. This type can reason flattening on one next of the forehead and impact the shape of the eye socket and also nose.Lambdoid synostosis. This deserve to lead to flattening top top one next of the earlier of the skull. It have the right to also affect the positioning of the ear or cause the skull to tilt sideways.Metopic synostosis. This can cause a triangle-shaped skull or sharp forehead. That can likewise make the eyes appear closer together.Sagittal synostosis. This type may reason the forehead come bulge out. The area around the holy places might likewise appear very narrow, do the head look elongated.

Craniosynostosis needs surgical therapy to avoid later complications.

Other conditions

Some other problems that can influence the cranial skeleton include:

Cleidocranial dysplasia. Mutations come a particular gene cause unusual development of the teeth and also bones, including the cranial bones. Typical symptoms incorporate a sloped forehead, extra bone within skull sutures, and an enlarged skull.Craniometaphyseal dysplasia. This is one inherited problem that causes thickening that the cranial bones, which deserve to lead come a protruding forehead and wide-set eyes. Paget’s an illness of bone. new bone tissue is swiftly made due to unusual habits of osteoclasts, which space a kind of bone cell. Human being with this problem are an ext prone to fractures since the affected bone is generally weaker.Fibrous dysplasia. This causes the breakthrough of scarlike tissue rather of bone tissue because of a mutation in bone-producing cells. It has tendency to only impact a solitary bone at a time, though much more may be associated in part cases.Osteomas. an osteoma is a bright overgrowth the bone ~ above the skull. People with osteomas generally have no symptoms. However, if the development puts push on a nerve, it can cause hearing and vision problems. These normally resolve when the expansion is removed.

Symptoms that a cranial bone condition

With all the frameworks in her head and neck, it’s sometimes tough to pinpoint when symptoms room coming native an problem with the cranial bones.

Symptoms that indicate some form of cranial bone fracture include:

clear liquid or blood draining indigenous your ear or nosea emotion of weak in her face

Symptoms the a structural concern with the cranial bones include:

a dull, aching painnumbness or study abroad in her facehearing or vision problemsunusually shaped head or face features

Your cranial bones room the main defense device for her brain, so it’s necessary to maintain their health by:

Wearing a helmet. always wear a helmet once riding something on wheels, consisting of bikes, skateboards, and also scooters. Change damaged or dented helmets and also make certain they to the right properly.Fastening your seatbelt. constantly wear a seatbelt once traveling in a car.

See more: 5 Things A Repo Man Can A Repo Man Knock On Your Door In The Middle Of The Night

Reducing your hazard of falling. for sure anything, such as loose electrical cords, that could reason someone to trip. If you have mobility issues, take into consideration installing handrails and grab bars in areas, such together the shower or stairs.

If you have an infant, be certain to monitor your head for anything unusual. Friend can likewise make certain you kid doesn’t continue to be in one position for also long. Some ways to carry out this include:

alternating the direction your baby’s head deals with when putting them to bedholding your baby when they’re awake rather of placing them in a crib, swing, or carrier, once possiblechanging the eight you host your baby with as soon as feedingallowing your child to beat on their stomach under close supervision

Medically the review by Seunggu Han, M.D. — written by Jill Seladi-Schulman, Ph.D. — to update on may 24, 2018