Alveolar ridge of the maxilla Nasofrontal process of the maxilla Body of the zygoma. The most common portion of the orbit to sustain a fracture is the weak floor, and this injury, if occurring in isolation, may result in a blowout fracture. A blow to the globe causes increased intraorbital pressure. This causes a fracture of the thin plate of bone forming the floor of the orbit i. Some of the orbital contents such as fat and muscle herniate downwards into the maxillary sinus resulting radiographically in a soft tissue "teardrop", or polypoid mass, in the roof of the maxillary antrum:.
The neurocranium is comprised of eight bones: occipital, two temporal bones, two parietal bones, sphenoid, ethmoid, and the frontal bone. The neurocranium forms the cranial cavity that surrounds and protects the brain and brainstem. The neurocranium consists of the occipital bone, two temporal bones, two parietal bones, the sphenoid, ethmoid, and frontal bones—all are joined together with sutures. Evolutionary,it is the expansion of the neurocranium that has facilitated the expansion of the brain and its associated developments. Neurocranium : A lateral view showing the bones that structure the neurocranium. The occipital bone forms the base of the skull at the rear of the cranium. It articulates with the first vertebra of the spinal cord and also contains the foramen magnum, the large opening of the skill through which the spinal cord passes as it enters the vertebral column.
NCBI Bookshelf. Bradley W. Anderson ; Khalid A.
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