72 PHYSIOLOGY. 



a, a, the coronal, suture, from the Latin corona, crown, so called 

 from its situation on that part of the head, upon which the ancients 

 placed the laurel, or olive crown, given to the victors in their games. 

 It connects the frontal to the parietal bones ; 6, the sagittal suture, 

 from a Latin word, signifying arrow, from its straight course. It runs 

 from the middle of the frontal to the angle of the occipital bone, con. 

 necting the two parietals ; c, the lambdoidal suture, extending from 

 tne sagittal suture down to the base of the brain on each side ; e, e t 

 the scaly overlapping of the temporal upon the parietal bones ; hence 

 called squamons suture. 



18. The frontal bone is one of the most important in the 

 skull. It has been compared to a clam-shell from its shape, 

 and it forms the fore-head, part of the temples, and the roof 

 of the orbits of the eyes. Like the other bones, it is com- 

 posed of two plates, which often recede from each other, 

 immediately over the nose to a considerable distance, leaving 

 a space between them called the frontal sinuses. These 

 cavities communicate with the nose, and are supposed to 

 increase the intensity of the sound of the voice, and also to 

 render it more melodious. The change of voice, observable 

 in a person affected with a cold, is owing to a closure of the 

 passage between the nose and cavity, preventing the access 



