8S The Anatomy of a HOKSZ. Chap. VI. 



-which fprings from between its two dcfcending Procefles, 

 long and round, its Head refembling the upper part of the 

 Dog-tooth in Man, or the Tu(h in a Horfe. It is alfo co- 

 vered with a Cartilage on that part which is received into 

 the forefaid Sijius of the firft Vertebra ; upon it the Head 

 turns round, as upon a Hinge. The Bafis of this Tooth- 

 like Appendage is encompalled with a Ligament that knits 

 iit to the Occiput, This and the following Vertebra have 

 Spines, or hinder Procefles, each of which are divided into 

 two, for the better Connexion of the Ligaments and Muf- 

 cles to them ; and are, in every Refpedt, like the fecond, 

 fave only that their lateral Proceiles are larger, and divided 

 as welHs the hinder. 



§. IV. Of the Vertebrae of the Back and Loins, as alfo of 

 the Breafl-bojie, Collar- bones, and Ribs, 



P^o/e of the The Back is made up of fcventeen Verte^ 



Back and Lotns. Ira, or Rack- bones, which are Ibmewhat 

 different, both in their Bodies and Proceiles, 

 from thofe of the Neck, the laft being longer and more flat 

 on their Infide, that the Gullet might relt more fecurely on 

 them ; and as for their Proceiles, though they are equal in 

 Number, viz, two tending obliquely upwards, and two 

 tending obliquely downwards, two tranlVerfe, or lateral 

 ones, and one acute hinder one, called the Spine ; yet thofe 

 which are now to be defcribed, have their Spines, or hinder 

 Procefles fingle, and not divided, and their lateral ones more 

 fhort and blunt ; and inftead of the Holes which are in 

 thofe of the Neck, have only a (hallow Cavity, into which 

 the Ribs are articulated. 



Neither are the Bodies of thefe Vertebra of fuch a firm 

 and folid Make as thofe of the Neck, though they are more 

 bulky ; befides that they are full of fmail Perforations, for 

 the Admiffion of Blood- veffels to the Spinal Marrow, and 

 have each two Holes at their Joinings, for the Egrefs of the 

 Nerves which proceed from thence. 



They have alfo on each fide a Si^ms, or Cavity, for the 

 Inarticulation of the Head of the Rib, which Sinush are 

 wanting in thofe of the Neck, having no Communication 

 with any other but among themfelves. 



The tranfverfe Proceries of two or three of the lowefl 

 of thefe Rack- bones grow gradually fliorter, and their 

 Spines more blqntand even, declining not fo mucii down- 

 wards 



