106 



THE SKELETON 



They are rough for the attachment of the muco-periosteum, and near the posterior 

 margin is the ridge for the fibrous expansion of the tensor veil palatini. The fol- 

 lowing points are readily recognised (fig. 129) : — • 



Themeso-palatine suture commences at the alveolar point, traverses the incisive fossa, and 

 terminates at tlie posterior nasal spine. 



The transverse palatine suture, between the palate bones and palatine processes of the 

 maxillae. 



In young skulls the incisive sutures, and behind the incisor teeth four small openings 

 known as the gubernacular canals (see figs. 114 and 129). 



The incisive fossa containing the termination of four canals: two small orifices, foramina of 



Fig. 132. — The Skull. (Norma facialis.) 



Zygomaticus ~" \A^- 'v 



Quadratus lahii superioris ^;^" ^^^ 

 (zygomatic head) 



Surface covered by 

 frontalis muscle 



Corrugator 



Orbicularis oculi 



Quadratus labii superioris 

 (ancular head) 



Quadratus labii superiosis 

 (infraorbital head) 



Caninus 



Nasalis (transverse 

 portion) 



Nasalis (alar portion) 

 Orbicularis oris 



Scarpa, .situated one l)chind the other in the meso-palatine suture; and two larger openings, 

 the foramina of Stenson. The foramina of Scarpa transmit the naso-palatine nerves, and those 

 of Stnn.son are in relation (embryonic) with the organs of Jacobson. 



At the posterior angles of the hard palate are the greater palatine foramina, through which 

 the dcscciKling j)alatiii(; ve-isols and t lie anterior ])alatine ncM'ves emerge on to the palate; a thin 

 lip of bone .sejJHratr's them from the lesser palatine foramen in the tuberosity of the palate bone 

 on each side, fcjr the ijostcrior palatine nerve. 



The hamular process of the medial pterygoid plate is the most posterior limit of the hard 

 palate. 



At the posterior extremity of each alveolar ridge is the tuberosity of the maxilla, and between 

 it and the palate bone is a foramen (variable in size and sometimes absent), the middle palatine 

 foramen, for the middle palatine nerve. This foramen is often included under the lesser pala- 

 tini! foramina (BXA). 



