H The Ayiatomy of aHOWS^. Chap.IU. 



veflels, which retain to and from tlie lower Belly ; as alio 

 a large one for the Gullet. 



It V-fTl ^^ ^^' Veins from the Trunk of the Cav'i^ 



'•^^ ' with fome Twigs from the Vena jlJipoJh. 



Its Arteries are from the Jorta : Its proper Nerves arc 

 two, proceeding from tlie Spinal Marrow at the third or 

 fourth Joinings of the Rack-bones of the Neck, being in 

 their Courle fuftain'd by the MediajVumm. Thefe Nerves 

 enter in at its Center, and difperfe themfelves thro* as 

 whole Subltance. 



J jjr Its chief Ufe is in Refpiration, and is 



. ^ ■^^' the principal Mufcle tliat aflifts in that 



Adion, dilating and contracting itfclf as the Ribs are 

 dilated and contrafted. It js alio uleful in afTilVing the 

 Periftaltkk Motion of the Guts, whereby the Chyle is 

 forwarded into its Vellels, and the Excrements to a Dif- 

 charge. It is moreover ufeful to divide the lower Belly 

 from the Cheft, as has been obferved. 

 _. ,. J. ^. As the Diaphragm divides the lower 



Dum ' ^''^^y ^''°'^ ^^^ ^^^^' ^° ^^^ Msdmftinum 



divides the Cheft in the Middle. It is a 

 double Membrane arifing from the Pleura or Rib-coat, 

 ■yvhere, beginning at the Breaft-bone, it holds a dire«ft 

 Courfe towards the Back. Near the Back and the Breaft 

 this Membrane i« united for a little Way ; but in the Mid- 

 dle it is feparated fo wide, as to contain the Heart and its 

 Pericardium^ or Bag : It is like the Pleura from whence 

 It proceeds, very fmooth on its outfide towards the Lungs, 

 but fomewhat rough towards the Heart, by reafon the 

 Perhardium adheres to it by feveral Imall membranous 

 Filaments. 



r, rr ^j Tt has Veins from iht Phrenica. or Mid- 



its yClklS. . „ . , - y rr r • • 



•^ rur-vcni, and from the l eua Jiue pan ; it 



has alfo one from the Subclavian^ which is proper to it, 

 called the Mediafllna. Its Arteries fpring from the Phre- 

 ?iic'a^ and its Nerves are detach'd from that Pair, which 

 defcend by it to the Midriff. 



j^^ jjr Befides its Ufe in dividing the Bread, it 



preferves the Heart from being hurt in its 

 •Motion by the bony Sides of the Chcft. It is further ufe- 

 ful to fuftain the Veflels which take their Courie thro' it ; 

 and by its being knit to the Midriff, preferves that Mufcle 

 from being drawn too much downwards by the Weight of 

 the l/i'/er, whofe fufpenfory Ligament is fixed to it. 



$. II. 



