114 



THE SKELETON. 



wing of the sphenoid. On it are seen the orifices of one or two malar canals, and 

 the suture connecting the sphenoid and malar bones. 



Angles. The superior external angle is formed by the junction of the upper 

 and outer walls; it presents, from before backward, the suture connecting the 

 frontal with the malar in front and with the great wing of the sphenoid behind : 

 quite posteriorly is the foramen lacerum anterius, or sphenoidal fissure, which 

 transmits the third, the fourth, the three branches of the ophthalmic division of 

 the fifth, the sixth nerve, some filaments from the cavernous plexus of the sym- 

 pathetic, the orbital branch of the middle meningeal artery, a recurrent branch 



Fro ii t a I bone 

 r 



TENDO OCULI 



FIG. 7o. Antero-lateral region of the skull. (Cryer.) 



from the lachrymal artery to the dura mater, and the ophthalmic vein. The 

 superior internal angle is formed by the junction of the upper and inner wall, and 

 presents the suture connecting the frontal bone with the lachrymal in front and 

 with the ethmoid behind. The point of junction of the anterior border of the 

 lachrymal with the frontal has been named the dacryon. This angle presents two 

 foramina, the anterior and posterior ethmoidal, the former transmitting the anterior 

 ethmoidal vessels and nasal nerve, the latter the posterior ethmoidal vessels. The 

 inferior external angle, formed by the junction of the outer wall and floor, presents 

 the spheno-maxillary fissure, which transmits the superior maxillary nerve arid its 

 orbital branches, the infraorbital vessels, and the ascending branches from the 

 spheno-palatine or Meckel's ganglion. The inferior internal angle is formed by 

 the union of the lachrymal and os planum of the ethmoid with the superior max- 



