AND FAMILY DISPENSATORY. 49 
mott vertebra of the breaft, and is inferted into all the external tranfverfe eminences 
of the neck. 4. Spinatus, arifing from the roots of the feven uppermott vertebra of the 
breaft, five of the neck, and is inferted into the >t or point of the fecond vertebra 
of the neck. . 
The mufcles of the breaft or thorax are in number fixteen, viz. eight on either fide, 
of which the firft five widen or lift up the breaft: the laft three contraé it; to thefe 
add, as a ninth, one peculiar mufcle, called diapbragma or the midriff. 1. Subclavius, 
it arifes from the inner part of the clavicula, is of a flefhy fubftance, and is drawn up- 
wards and outwards, and inferted into the upper part of the firft rib. 2. Serratus 
major, the greater faw-like mufcle, it reaches from the inner bafis of the Seapula 
unto fix and fometimes feven of the ribs. 3. Serratus pofficus fuperior, which grows 
out of the fharp points or {pines of the three lower vertebra of the neck, and the firft 
of the back, and is inferted into the three upper ribs, and fometimes into the fourth. 
4. Mufculi intercoftales externi, thefe are eleven pair in number, but perform the office 
of one mufcle only ; are interwoven, totally fiefhy, and arife from. the lower parts. 
of the upper ribs, and, defcending obliquely towards the back | parts, are inferted. 
into the upper parts of the lower ribs, terminating on the cartilages. 5. Ti riangula- 
ris, it is {mall and thin in lean perfons, fprings out of the inner and lower part of the 
fternum, and is inferted into the cartilages of the lower ribs, as far as. the third or 
fourth of the baftard ribs. 6. Sacrolumbus, which {prings from the os Sacrum, and the 
{pinous procefles of the loins, and is inferted into the upper ribs near their roots, _ 
beftowing upon each rib a double tendon, one external, the other internal. 7. Ser- 
ratus pofticus inferior, it is oppofite to the fuperior, and both of them, by a broad 
and membranous tendon, fo grow together, that they ferve inftead of a “band to - 
keep the hinder mufcle of the back-boné together : it grows out of the fpines or 
procefles of the three lowelt vertebra of the back, ‘and firft of the loins, i is terminated 
in three or four of the lower ribs. 8 Mujcult intercoftales interni, thefe are the fame 
in number and place with the externi, and lie direétly under them ; they are carried 
obliquely from the nether rib to the uppermoft, and have fibres contrary to thofe 
of the external, croffwife interfected. 9. Diapbragma or midriff, called alfo precor- 
dia, becaufe it is ftretched out before the heart ; and phrenes, becaufe, being affected, 
the mind and fenfes are difturbed, by reafon of the ‘confent it has with the brain: fo. 
that, when the midriff is inflamed, a phrenzy is caufed. [It is one in number, an in. : 
ftrument of free motion, and an admirable kind of mufcle, both in regard of its. 
compofition and continual ation or motion, ferving alfo as a wall of ‘partition -t to. : 
fever the vital and natural parts one from another. The head of it is in the nerv ot “3 
center, but the tail in the <i cumference of the lower fhort ribs, from er 
29, O 
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