8^ The Anatoniy of aUOKS^. Chap. VI. 



but grow extremely thin upwards, lying like two Scales on 

 the lower Edge of the Bones of the Sinciput, 



They have each of them two Sinus's^ the outermoft being 

 the largeil, is lined with a Griftle, and receives the longer 

 Procefs of the lower Jaw. The other, or inward Cavity, 

 is common to the Temple-bone and Noll-bone. There 

 are alfo four Procefles belonging to each Temple-bone, viz, 

 that which in Man is called the Procejjiis Styloides^ or Pen- 

 like Procefs, though improperly in a Horfe, it being but 

 fhort. The next is called the Procejfus mammillaris^ being 

 fomewhat fhap'd like a Nipple. The third paffing forwards 

 fiom the Hole of the Ear to the Protuberance of the iirft 

 Bone of tlie upper Jaw, and being joined to the laft, forms 

 the Os Jiigale^ or Yoke- bone. The fourth is the Procejfus 

 petrofuSy or hard and uneven part of the Temple- bone ; 

 this, beifig internal, jets out a pretty Way into the Infide 

 of the Bottom of the Skull, within which there are two Per- 

 forations j one to give a Pallage for an Artery, another for 

 the Auditory Nerve, mto the inner Cavities of the Ear, to 

 wit, the T'ympanum^ Lahyriiith^ and Cochlea, 



This Procefs has alfo on its outfide three Perforations, or 

 Holes ; the firlt called the Meatus auditorius^ or Auditory 

 PaiTage ; the fecond is that thro' which the Jugular Vein 

 enters into the inner Cavities ; the third is feated between 

 the Mammillary and Styloid Procefl'es, ending in that Paf- 

 fage that goes from the Ear to the Mouth. As to the liitle 

 Bones that are contained in the Cavities of this Procefs, vi%, 

 the Incusy Malleus^ Stapes^ and Os orhiculare^ which, 

 with thofe already defcrib'd, make up the whole Number of 

 the Bones proper to the Skull, having taken notice of them 

 already in another Place, I lliall therefore pafs on to thofe 

 which are common to the Skull and upper Jaw ; and thefe 

 are in Number three, namely^ the Os Sphenoides^ or Wedge- 

 like Bone, the Sieve-like Bone, and the Toke-Uke Bone. 

 The Weds-e-like ^^^ Wedge-like Bone is fo called from 

 Bone^ ^^^ ^^'"S placed like a Wedge between the 



Bones of the Skull and the upper Jaw ; it is 

 joined before to the Frontal Bone^ and behind to the Occi- 

 pitaly its Sides to part of the Petrofum above, and below 

 to fome of the Bones of the upper Jaw and Palate. 



It has feveral Procefles, fome external, and fome internal ; 

 as alfo divers Cavities, two of which are common to it and 

 the Temple bones, and the Bones of iht Sinciput. Its Holes 

 are about fcven on each fide i one of which gives a Paflage 



to 



