Chap. VI. ne Jnatom of a HOKSE, 85 



to the Optid Nerve, the reft are penetrated, fome by one, 

 and Ibme by leveral Parts of Nerves ; others by the Carotid 

 Aneries and Jugular Veins; and again, others both by 

 Nerves and Blood- veilels. 



The Os Cribriforme is the next Bone ^ke Os Cri- 

 common to the Head and upper Jaw, and is briforme, or 

 fo called from its innumerable little Holes, ^ic'vclikeBone, 

 which make it like a Sieve. It is fituated in the fore and 

 under Side of the Skull, between and a little below the 

 Sockets of the Eyes, and at the upper Part of the Noftrils, 

 and is joined by an even Line to the Forehead bone, the 

 fecond of the upper Jaw, and the Wedge-like Bone. 



It is made of four Parts, viz, the Crijla Gallic or 

 Cock's Comb, to whofe (harp Appendix the Falx adheres. 

 The fecond Part is that which is perforated, and makes up 

 the greateft Portion of it. The third is only a Procefs of 

 its under Side, by which the Noftrils are divided : And 

 the fourth is called the Os Spongiofum ; its Cavities being 

 filled with a fpongy fort of Flefh. This Bone helps to 

 make up the Corner of the Orbit of the Eye, and through 

 its Holes gives a Paflage to the innumerable J^ibrilla of the 

 Auditory Nerves. 



The laft is ihe Jugale or Yoke-like Bone, q„ . . 

 and is compofed of two Bones ; one of which ^ J "^^ • 

 is a Procefs of the Temple- bone, and the other a Procefs 

 of the firft Bone of the upper Jaw j forming the lower Sid3 

 of the lefler and outer Corner of the Orbit of the Eye. 



§. II. Of the Jazv-bonss and Teeth^ together ivith the 

 Os Hyoidcs, or Bone of the Tongue, 



Befides the Bones which are common to 

 the Skull and upper Jaw, there are twelve, ^'^'f '^^ ^f ^^ 



r u c- 1 \- u * proper to the 



VIZ. fix on each Side, which are proper to j^pL^j^^^^ ^-^^ 

 the upper Jaw alone, and are thofe which 

 frame the lower Side of the Orbit of the Eye, the Nofe, 

 Cheeks, and Roof of the Mouth. 



The firft is called Zygomaticum^ becaufe ^^ rn ^y^ 



its Procefs makes up a Part of the Os Jugale : gomaticum 



It compofes the lower Part of the outer nx^ithitsfeUlija^ 

 Corner of the Eye. 



The next is feated in the inner Corner of '^he fecond, 

 the Orbit of the Eye, and is called Lachry- Lachrj-male, 

 male^ becaufe it has in it a Cavity which con- 

 tains the Lachrymal Gland. This Bone has alfo a Perfora-* 

 G z tion 



