DEGLUTITION. 
to their fun&ions dai if they had changed aan to 
the ued acl or eer: of the body in genera 
fize an Te. moft contraéted ftate, it forms a 
{mall iverfe groove with corrugated edges. It may 
extended laterally o aie feparation of bot 
may alfo be changed by the motions of the lips 
which can be feparated to a confiderable diftance, their 
edges being at the fame ped turned out, and a larger fur- 
nail 
not defined by any precife limits ; a eee 
are the cheek-bone above, the bafe of the eee 
the commiffure of the lips in ae and the projection of the 
maffeter behind. Towards t uth on the contrary, 
they are bounded a both above and below, by the 
sienna fe) ucous membrane from their furface to 
€ 
ny nie ig Gace {kin, from which there are but 
few hairs growing, particularly towards the middle. In 
this part it is particularly diftinguifhed by its capillary fyftem, 
through which a large aaa of blood is conftantly cir- 
oe in young and healthy perfons. This being Hiable 
o fudden are accidental changes, either of increafe or dim 
ce becomes an involuntary index of the affe€tions of fie 
xnind ; whether, as in the pie motions, and likewife 
in anger, indignation, its momentary diftention gives rife to 
that vivid rednefs of the cheek, which extends, i in a diminifhed 
; or, as in the deprefling 
and forrowful paffions, the fam rts become overfpread o 
The capillary fyftem 
ed i in difeafe, where it is 
which is lined internally by the mucous membrane of the mouth, 
feveral round mucous glands ames buccales) being inter- 
pofed between it and the mu 
Mufeles of the hoa and Cheeks. 
Noafalis labii fuperioris. —TVhis, which is defcribed by Al- 
Dinus as a diftinct mufcle, is ida eer a part of the orbi- 
eularis, It eae ina pointed form from the tip of the nofe, 
. openings of the n 
ae them together, 
and from the feptum narium, and, growing thicker as it 
defcends, turns outw ards, and terminates in the orbi cnlaris. 
Tt will alfo elevate and 
turn outwards the upper lips fo as to apply it againft the 
oftrils. 
Levator labii elias et ale nafi, (pyramidal and lateral 
dunez).—This i very commonly defcribed as forming two 
ache rani a proper elevator of the ta lip, ‘and a 
elev. f it and the ala nafi : 
der ne dilinction fufficiently marked, ae therefore de= 
It arifes in a pointed manner, from 
afal procefs of the upper jaw, where it is confufed 
ail ie frontal mufcle ; it defcends along the fide of the 
8 
depreflor ale nafi; 2dly, into the upper lip 
corner of the mouth, by an union of its fibres with thofe of 
the orbicularis a and levator angull. 
It is covered on the nofe partly by the integuments, and 
by the orbicularis palpebrarum and facial vein; lower down 
by the two former parts.’ It covers the os nafi, the nafal 
procefs of the fuperior maxillary bone, the depreffor ale nafi, 
levator anguli oris, and infra-orbitar veffels and nerves. It 
elevates the upper lip, and the ale of the nofe ; and as both 
thefe effects are produced by the fame mutcle, it is difficult 
to raife the lip without, at the fame time, moving the nofe. 
exerted in all the angry and fcornful affe€tions of the 
mind. - 
Zygomaticus oe or diftoertor anguli oris.—This is a 
rather elongated and flender mufcle, produced in an oblique 
dire€tion air the convexity of the os male to the corner 
the mouth, and terminating by a continuation of its 
fibres nn thofe of the orbicularis ad other mufcles of the 
lips. It is covered externally by the fkin of the cheek, and 
it lies upon the os mala, the facial vein, and the buccinator 
u of the mouth towards the 
depreffor anguli, furface li 
Jabii fup. et ale nafi, with the infra-orbitar veffels and nerves. 
Behind it are placed the furface of the jaw-bone, the mem- 
brane of the ieee and the buccinator. It elevates the 
corner of the and thereby reftores the parts which 
have, been deprelled | in the forrowful’ emotions. 
Depreffor 
