DISSECTING MANUAL. 



HEAD AND NECK. 



BONES OF THE SKULL. 



The skull comprises the bony envelope of the brain, and the 

 bones of the face ; the hyoid bone is usually described with it. 

 The cranium is the skull minus the inferior maxilla. Because 

 it is so found in dissecting, it will be described as a whole, fol- 

 lowing brief descriptions of the shape and position of the bones 

 forming it. [103] 



The frontal bone occupies the front of the cranium and con- 

 sists of three parts. The frontal part is shell-like, corresponds 

 to the forehead, and rises above the orbital arches. The orbital 

 part is horizontal and consists of two orbital plates, which ex- 

 tend backward from the orbital arches and are separated in 

 their posterior halves by a notch (ethmoidal) . The nasal part 

 helps form the roof of the nasal fossae. [103] 



The two parietal bones form the top of the cranial vault 

 and lie behind the frontal; they are quadrilateral. [107] 



The occipital bone occupies the lower and back part of the 

 cranium and consists of three parts which surround the fora- 

 men magnum. The squamous (tabular) part is the expanded 

 curved plate behind the foramen ; its superior borders unite in 

 the superior angle, and end laterally in the lateral angles. The 

 lateral (condylic) portions lie on either side of the foramen, 

 while the basilar part lies in front of it. [109] 



The two temporal bones lie on either side of the cranium 



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