Injury during birth, head trauma, vitamin A toxicity, separated or malformed sutures, application of pressure, or rare congenital conditions can cause indentations in the skull, according to Healthline. When one of the skull's bones cracks, the depressed skull fracture sometimes dents inward, according to Drugs.com.Know More
As children develop, the six bony plates in the skull normally fuse together to form a suture, strong and flexible tissues, at the edges of the plates, according to Healthline. In rare cases, the sutures separate, causing large gaps in the skull that sometimes form an indentation or bulging area, most notably on the top of the head. Hypervitaminosis A is toxic levels of vitamin A that in children and infants can cause softening of the skull bone and bulging of the soft spot at the top of the head.
Positional plagiocephaly, prolonged pressure to the skull while in the uterus or during birth, is the most common cause of skull deformities in children, according to the Craniofacial Center. A less common cause of dents and bulges in the skull is craniosynostosis, in which one or more of the cranial sutures prematurely fuses together. Though the sutures that connect the skull bones cannot be pulled apart once formed, injury or trauma can cause misalignment of the cranial plates, leading to indentations and bumps in the skull, notes Van Family Chiropractic and Wellness Center.Learn more about Bones
BBC states that the only movable joint on the skull is part of the mandible, or the lower jaw bone. According to the University of Washington School of Medicine, the joint formed around the mandible is known as the temporomandibular joint.Full Answer >
Examples of fixed joints include the joints between the bones in the skull and the joint where the radius and ulna bones meet in the lower arm. Fixed joints, also known as fibrous joints, are places where two bones come together in the body but are unable to move. This type of joint is held together by fibrous connective tissue rather than ligaments and tendons.Full Answer >
According to About.com, the odontoid process serves as a pivot point for the skull and first cervical vertebrae, which allows the head and neck to rotate. The odontoid process is a projection that grows off the front portion of the second cervical vertebrae, which is also called the axis.Full Answer >
The brain is protected by one of two main parts of the skull called the neurocranium, which actually consists of eight different bones. The neurocranium includes the frontal bone, two parietal bones, two temporal bones, occipital, sphenoid and ethmoid bones.Full Answer >