DEGLUTITION 
ef the canal of ees . The snk maxillary ligament 
tended from the Ayloid procefs to 
jaw, ces it is en ae: tg infertions of che mafletcr 
and pte e ftylo sloffus ae is at- 
tached to a er ea Length, Gi this tigament. The f. 
ae or capfule of the joint, confifts of two 
t indeed be very clearly diflinguifhed from 
nen he upper furface of the articular cartilage ; _ 
is toad oo one of thefe parts to the other, at “the 
cumfererce of each. The lower ates covers the iaease 
furface of the car rage, andi is ieee 
the condyle, being continued lower down on the 
than on the anterior farface of the eal 
of the low wer jaw c alkane 
x TO communication we each other. “The fy- 
glenoi id cavity. The cartilage of the 
figures lai ofed between the max 
1e full; its two plese are 
& 
coed gland near the 
lower jaw is of an oval 
back — of it its aoe - furhice, to correfpond to the articular 
eminence and glenoid cavity. 
eppled only to the convexity of the condyle. Its two 
faces are clofely covered by the corre{ponding porticus of 
fynovial membrane; the circumference is free between the 
reflexions of thefe membranes, except externally, where the 
centre, and may near ly equal the t half a crown 
in the former iota, ; it is alfo thicker behind at the gle- 
to wards the front, where it is interpolcd 
ach other. 
other articular cartilages; the fibres, -_ are concentric, 
€ mot evident pital the circumfere 
—The ecb of the face ma 
- ints of v 
the lower jaw. 
the objects a ce to in 
of motion int 
Rea a. yi ie he Faw.—Force is applied to the 
hree cirechions 5 itt, from below a 
framing the former; and facility 
2 pie 
motion is chiefly tran{micted, and the seta impulfe com. 
municated to the dental margin or the upper. Henc 
upports of the ee correfpond 
imate receiving little or no impulfe towards irs middie, is 
furnt with a very flender fupport in that fituation. The 
se earns indecd feems sae Sten to ie on ca- 
, trom which its name is d than concu 
Ne ne see to which its oe is aaihely rs 
quate. Moreover, ‘as it is connected above to the thin eri- 
bri forin plate, any ftrong impulfe communicated im that di- 
We 
will refi! 
no fupport is a ie aaa 
the orbits. The fityaton of the 
adapted by their fize and frength for tearing tough and hard 
fubftances, are f{upported by the nafal apophy fess while the 
molar teeth, which bruife and finaly comminute the food, 
are placed in the moft refitting: portion of the alveoli, viz. 
that which is fi the cheek-b ‘The bicuf- 
: communicated to the de 
gin of the upper jaw is eens to the frontal bone, at 
its internal and external orbitar proceifis. The ctimoid 
may likewife tranfimit a imall part of the impulie, fince it 
alfo is placed between the — and upper Jews -bones. 
The os ai which is impelied ia t 8 way upwar fur- 
nifhed with a point of retiitance Chae in the ae 
portion of the temporal bone ; and in that circumftance con- 
' $ = vantage of the mode in which the latter overlaps 
The pr coun conlideratious baat It Very 
} 
ae ae a'l the impulfe, tranfmitted from 
the upper jaw, is ultimately communicated to ie cranlum, 
and there loft. Hence it has been inferred, that if, in cafes 
of fra€ture, a elie body be a between the teeth, and 
thrown into vibration; cr 1 ard body, a nut, be 
cracked between the teeth 3 Gat a impulle chu produced 
of the injury: an writer 
thefe pe as eae paleian ah nder 
ftanc ear to us like the off spring of t 
axination, than the refult By iy aera and experience ; 
y often feel a kind of fhock in the fkull, 
e lower race ie as blades of (cit. 
an orm their edges 
favour this has bag by wiich ae interpofed fub- 
ftances are cufpidati overlap a ittle 5 
but the grinders, ice. breif, she folid parts of the food, 
‘ame vertical line. 
ced in the {econd direétior, only b 
fe of a blow or fall on the tace. 
The pterygoid proceffes and the zygomatic arches are the 
refilling points, which fuftain the effort in thole cafes; and 
it is tran{mitted from thefe to the cranium. Perions have 
fuppofed that a fhock, affecting the front of the nofe, might 
be tranf{mitted to the “am through the feptum narium. 
But that part is too weak fo a an an effort, which, in point 
of fact, does not feem rere 
The propagation of a lateral fhock cannot be eafily 
mated, fince there is no {upport oppolite to ti hook Daca, 
Bet it mutt uo doubt be Jott in the fide of the head. 
The upper jaw wili be found to muve a ‘Tittle = tha 
Mm3 now 
uth 
