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Characteristics Of The Skull

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The skull forms the general organs of the head. It is formed by two bones namely: cranium and facial bones. The cranium encloses and protects the fragile brain tissues whereas facial bones hold the eyes in an anterior position and allow the facial muscle to show feelings through smiles or frowns. The skull is held together by sutures which are interlocking immovable joints. Only jawbones (mandible) are attached to skull by freely movable joints.

The cranium is boxlike in shape and it is made up of eight large flat bones with exception of two paired bones; parietal and temporal (which are all single bones). Flat large bones are frontal, parietal, temporal, occipital, sphenoid, and ethmoid bones. Frontal bones form the forehead and bony structure …show more content…
It forms the base and back wall of the skull. At the lambdoid suture occipital bone joins parietal bones anteriorly and it has a large opening called foramen magnum. Foramen magnum allows spinal cord to connect with the brain. On the lateral side of foramen magnum is occipital condyle, which rests on the first vertebra of the spinal column. Sphenoid bone is butterfly shaped bone that surrounds the width of the skull and forms part of the floor of cranial cavity. Sphenoid bone has sella turcica on its midline which is a small depression that forms a snug enclosure for pituitary gland. The central part of the sphenoid bone is riddled with air cavities called sphenoidal sinuses. The ethmoid bone is irregularly shaped and is located anterior to the sphenoid bone. It forms the roof of the nasal cavity and medial walls of the orbits. It has a crista galli that projects from its superior surface. Crista galli has holes on its side that allows nerve fibres carrying impulse from olfactory receptors of the nose to reach the brain and they are called cribriform plates. Ethmoid it’s extended into the superior and middle nasal conchae that increase the turbulence of air flowing through the nasal passageways by forming lateral walls of the nasal …show more content…
Twelve of them are paired whereas mandible and vomer are single. Facial bones are maxillae, palatine bones, zygomatic bone, lacrimal bone, nasal bone, vomer bone, inferior nasal conchae and the mandible. The maxillae consists of two maxillae or maxillary bones which fuse together to form the upper jaw. All facial bones join to it except the mandible. Facial bones are the main bones of the face. In the alveolar process the maxillae carry the upper teeth. The anterior part of the hard palate of the mouth is formed by palatine process which is the extensions of the maxillae. Maxillae have paranasal sinuses which lighten the skull bones and amplify the sound made when the person speaks. Paranasal infection is called

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