24 The Anatomy of aWOKS^. Chap. III. 



vefiels, which retain to and from the lower Belly j as alfo 

 a large one for the Gullet. 



r y^/r^i^ It has Veins from the Trunk of the Cavay 



•^^ ' .with fome Twigs from the Vena Adipcfa, 



Its Arteries are from the Aorta: Its proper Nerves are 

 two, proceeding from the Spinal Marrow at the third or 

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

 their Courfe fuftain'd by the Mediajllnwn. Thefe Nerves 

 enter in at its Center, and difperfe themfelves thro' its 

 whole Subllance. 



7,^ jjr Its chief Ufe is in Refpiration, and is 



the principal Mufcle that afhfts in that 

 Adion, dilating and contrading itfelf as the Ribs are 

 dilated and contracted , It is alfo ufeful in afliHing tha 

 Perijlaltick Motion of the Guts, whereby the Chyle is 

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

 charge. It is moreover ufeful to divide the lower Belly 

 from the Cheil, as has been obferved. 

 m. rf^-r>' ^^^ ^^^ Diaphragm divides the lower 



^um ' ^'^^^>' ^^^'^ ^^'^ ^^'""^^ ^^ ^^^- Mediaftinum 



divides the Chcft in the Middle. It is a 

 double Membrane arifing from the Pleura or Rib-coat, 

 where, beginning at tlie Breaft-bone, it holds a dire6t 

 Courfe towards the Back. Near the Back and the Breaft 

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

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

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

 it proceeds, very fmooth on its outfidc towards the Lungs, 

 but foniewhat rough tov/ards the Heart, by reafon the 

 Peruardium adheres to it by feveral fmall membranous 

 Filaments, 



Its Veffeh ^^ ^^^^ Veins from tlie Phrenica^ or Mid- 



r'ljf-vein, and from iho, Vena fine pari -, it 

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

 called the Mcdiajiuia. Its Arteries fpring from the Phre- 

 nica, and its Nerves are detach 'd from that Pair, which 

 defcend by it to the Midriff. 



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



preferves the Heart from being hurt in its 

 Motion by the bony Sides of the Cheft. It u further ufe- 

 ful to fuftain the Veilels which take their Courfe thro' it ; 

 and by its being knit to tl^e Midriff, preferves that Mufcle 

 from being drawn too much downwards by the Weight of 

 the Liver, whole fufpeniory Lisament is fixed to it. 



