OUR BODIES AND HOW WE LIVE 



The vomer, or plowshare bone, so called from its resem- 

 blance to the share of the farmer's plow, is situated 

 between the nostrils. 



Two little scroll-like bones within the nose cavity are 

 known as the twisted or turbinated bones. 



36. How the Bones of the Head are joined together. The 



bones of the head are joined 

 together in a peculiar way. 

 Each bone has uneven edges, 

 somewhat like the teeth of a 

 saw, which fit into the edges of 

 the bone to which it is joined. 

 In adults these edges fit into 

 each other and grow together, 

 resembling the dovetailed joints 

 in a cabinetmaker's work. They 

 are called sutures, from a Latin 

 word which means a sewing or 

 a seam. 



In infancy some of the bones 

 of the skull do not meet, and 

 FIG. 16. The Base of the Skull. the throbbing of the brain be- 



A, palate process of upper jawbone ; nea th them at the top of the 

 .5. zygoma, forming zygomatic arch; , ,., , 1111- r 



C, condyle, for forming articulation head, like the bubbling of a 



with atlas; D, foramen magnum; S p rm a- is easily SCCll. These 

 , occipital bone. J 



openings are called fontanelles, 



meaning little fountains. The bones of the skull are not 

 wholly united till the child reaches adult life. 



37. The Hyoid Bone. Under the lower jaw is a little horse- 

 shoe-shaped bone, called the hyoid bone because it is shaped 

 like a Greek letter (v). The root of the tongue is fastened to 



