88 T/je Afiatom)> of a HOUSE. Chap. VI. 



which fprings from between its two defcending Procefles, 

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

 Dog-tooth in Man, or the Tufh in a Horfc. It is alfo co- 

 vered with a Cartilage on that part which is received into 

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

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

 like Appendage is encompalled with a Ligament that knits 

 it to tiic 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- 

 des to them \ and are, in every Rcfpedt, like the fecond, 

 fave only that their lateral Procefles are larger, and divided 

 as well as the hinder. 



§. IV. Of the Vertcbrge of the Back and Loin?., as alfo of 

 the BreaJ}-bo?ie^ Collar-bones^ and Ribs. 



T^oji of the The Back is made up of fcventeen Ferte- 



Back and Loins, hra., or Rack- bones, which are fomewhat 

 different, both in their Bodies and Procefles, 

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

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

 them i and as for their Procefles, though they are equal in 

 Number, vi%. two tending obliquely upwards, and two 

 tending obliquely downwards, two tranfverfe, 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 Angle, and not divided, and their lateral ones more 

 fhort and blunt ; and infl:ead 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 Imall Perforations, for 

 the AdmifTion of Blood-veflels 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 Sinus^ or Cavity, for the 

 Inarticulation of the Head of the Rib, which Sinus's are 

 wanting in thofe of the Neck, having no Communication 

 with any other but among themfelves. 



The tranfverfe Procefles of two or three of the loweft 

 of thefe Rack-bones grow gradually jjjorter, and their 

 Spines more blunt md even, dalining not ib much down- 

 wards 



