294 Explanation of [Book IX. 



w } iv 3 &c. Branches by which the right intercoftal 



nerve is joined with the fpinal nerves. 

 x } y y Thofe branches of the right intercoftal, which 



r y s, reprefent of the left, 

 z, z, Branches. 



A, A, Branches. 



B, B, The firft pair of cervical nerves. 



C, C, Branches, by which the fecond pair of cervical 



nerves is joined with the third. 



D, D, The fecond pair of cervical nerves. 



E, E, Branches, by which the third pair of cervical 



nerves is joined with the fourth. 



F, F, The third pair of cervical nerves. 



G, G, The fourth pair of cervical nerves. 



H I K, H I K L, The phrenic nerves, arifing by two 

 origins, the one H from the fourth cervical fair, 

 and the other I from the fifth. K, K, Their 

 trunks, the left of which, upon account of the 

 point of the heart's being turned to the left 

 fide, is bended towards the left. L, The ex- 

 tremity of the right, branched out upon the 

 diaphragm. 



M, M, The fifth pair of cervical nerves. 

 N, N, The fixth pair of cervical nerves. 

 O, O, The feventh pair of cervical nerves. 

 P, P, Branches of the firft pair of dorfal nerves, going 



to join the eighth pair of cervicals. 

 Q^ R, &c. The coftal branches of the dorfal nerves, 

 which run according to the length of the ribs. 

 Qi Q, The firft, R, R, the fecond, S, S, the 

 third, T, T, the fourth, U, U, the fifth, V, V> 

 the fixth, W, W, the feventh, X, X, the eighth, 

 Y, Y, the ninth, Z 3 Z 3 the temh, a, a, die 

 eleventh, (3, |3, the twelfth. 



$1 A bianch of the fecond coftal nerve, which paries 



through 



