THE SKELETON 



28 



of thin, curved processes. The anterior medial 

 segment, the entoglossal hone, is sagittate and 

 contained within the tongue. A movable joint 

 connects it with the body (hasi-hyal), the next 

 medial segment, which in its 

 turn is joined by cartilage to 

 a long, slender rod (uro-hyal) 

 — partly bony, partly carti- 

 laginous — which rests upon 

 the larynx. Each of the 

 lateral processes consists of 

 two rods of bone (hasi- 

 branchial and cerato - bran- 

 chial) joined by cartilage. 



Foramina of the Skull. — 

 The foramen magnum and 

 the optic foramen have been 

 noted already ; but there 

 remain to be mentioned a 

 number of smaller openings. 

 The small foramen of exit for , ^;^Vt ^"^'^!°^f ^t' !"''" 



hyal; IT., uro-hyal; B.b., basi- 



the twelfth cerebral nerve lies ^•■^"'^i^'^i; c.b., cerato- 



branchial. 



immediately to the side of 

 the occipital condyle. Still more lateral is 

 another small opening which permits the ninth 

 and tenth cerebral nerves to leave the cranium. 

 Close to the margin of the tympanic cavity is a 



Fig. 5. — Hyoid Bone. 



