40 CULPEPER’s ENGLISH PHY StChAN;-. 4 
merus, marked A, B, C, D, &c. toOO, the eighth and laft pair: from the third, 
fourth, and fifth, pair, are formed the nerves of the diaphragm ; and the fixth, 
feventh, and eighth, pair, together with P P, the firft pair of the back, form the fix 
sobuft nerves of thearm and hands. To this divifion is the acceffory fpinal nerve 
of Willis to be referred, which arifes about the origin of the third or fourth pair, 
The nerves of the back are twelve pair, marked P P, QQ, R, S, &c. toZ, and — 
«, 8, &c. which, befides the branch they give to the brachial nerves, run entirely in 
the fame furrow along the courfe of the ribs, and are difperfed over the pleura, the 
intercoftal, pectoral, and abdominal, mufcles, the breafl, and other partsof the thorax, 3 
The nervesof the loinsarefive pair, marked +, 9, #,T,©; with their branches, Hy | 
&c. Thefe are in general difperfed over the loins, the peritoneum, and the i ategu 
ments and mufcles of the abdomen: and, befides this, their firft pair often gives, “Bs 
“on-each fide, abranch to the diaphragm. The fecond pair, after inofculating with 
the branches of the firft, third, and fourth, pair, forms the crural nerves, 66, 77, — 
8 8, &c. which are diftributed over the anterior part of the thigh: and, in the fame 
manner, a branch is formed of the conjunétions of the fecond, third, and fourth, 
Pair, which paffeth through the great foramen of the os pubis to the fcrotum, the — 
tefticles, and the adjoining parts. The fourth and fifth pair of the nerves of the 
Joins, joining with the firft, fecond, third, and fourth, pair of the os facrum, com — 
pofe the nerve called ifchiatic, which isthe largeft in the body, being marked 3 35 
in fig. 2. it defcends along the hinder part of the thigh, and its branches are diftri- 
buted over the whole leg, the foot, and toes; being marked 15, 17, 18, 8c. 
The nerves of the facrum form five or fix pair, though not always determinately 
and regularly fo: they pats through the foramina of this bone, and the fuperior — 
ones of them, as already obferved, compofe the ifchiatic nerve ; and what remains is 
difperfed, in a multitude of ramifications, over the parts contained in the pelvis, the 
‘inteftinum rectum, the bladder, the parts of generation, and the parts adjacent: — 
‘They are marked, in the figure, a, =,11, 5, 8c. Boy Fea 
‘We thall only add, that 1, 1, fig. 2. reprefent the brachial nerves 5k» 2, &cc. the 
‘communications of the vertebral nerves with the intercoftals ; i, remarkable com- 
munications between the phrenic nerves and the intercoftals 3 by By ty Oe the nid 
ceffory nerve of the eighth pair; x x, the phrenic nerves ; and zz, the nerves which 
~ 
oe, Sang F THE MUSCLES. 
A MUSCLE is a fimilar, fpermatic, fanguinous, membranous, flefhy, fibrous, 
a 2th and the inftrument of voluntary or free motion. It is compofed of fibres, for | 
pee ss tention of the motion; of fieth, for the fubftance ; of tendons, which ac 
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