Skull1 - cranial bones (or cranium ) and the facial bones ....

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Skull Depending on their shape, bones are classified as long, short, flat or irregular. Bones of different types contain different proportions of the two types of osseous tissue: compact and spongy bone. While the former has a smooth structure, the latter is composed of small needle-like or flat pieces of bone called trabeculae , which form a network filled with red or yellow bone marrow. Most skull bones are flat and consist of two parallel compact bone surfaces, with a layer of spongy bone sandwiched between. The spongy bone layer of flat bones (the diploë) predominantly contains red bone marrow and hence has a high concentration of blood. Figure 2–2 Skull. (Reproduced from [Marieb 1991]). The skull is a highly complex structure consisting of 22 bones altogether. These can be divided into two sets, the
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Unformatted text preview: cranial bones (or cranium ) and the facial bones . While the latter form the framework of the face, the cranial bones form the cranial cavity that encloses and protects the brain. All bones of the adult skull are firmly connected by sutures . Figure 22 shows the most important bones of the skull. The frontal bone forms the forehead and contains the frontal sinuses , which are air filled cells within the bone. Most superior and lateral aspects of the skull are formed by the parietal bones while the occipital bone forms the posterior aspects. The base of the occipital bone contains the foramen magnum , which 27 is a large hole allowing the inferior part of the brain to connect to the spinal cord. The remaining bones of the cranium are the temporal , sphenoid and ethmoid bones ....
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