HE AD. 
‘oie The latter form two claffes, of which one con- 
fifts of mufcles attached to the lower jaw, or os hyoides, 
and includes ; 1; latiffimi colli , biventres maxille ; 
+ meyltirdiles 34> servi eae ; 5, geniohyoglofli ; 6, omo- 
hyoidei ; 7, fternohyoidei ; 8, fternothyroidei; 9, t 
fecond clas contains igen attached to 
the bones e the cranium, and confifts of : iterno- 
mattoidei ; recti capitis i interni majores; 3, certain fibres 
of the eee; ; 4, {plenii sage 5, complexi; 6, reéti 
mattoi idei. We obferve, 
rohyoidei. “The 
mufcles, where 
differ cootiderabily as to obliquity ; and by their 
tions at various angles, not only to itrengthen the sitiediodl 
of the bones, but to multiply the natural diagonals of their 
fibres. By this arrangement they combine their forces in 
fuch an infinite number of ways, and with fuch vat that 
the parts, which they move, are all moved, directed, and 
moderated, with but little change in the relative polition 
of their mufcular fibres, and ye et; at the fame time, with a 
rapidity, minutenefs, fteadinefs, ead accuracy, that Solr, 
eomprehenfion.” On the mufcular Motions of the Bod 
te me 
ich the head has 
have already ex lane ae the <. 
of the occipito-atloidal . articulation. Place the ‘vl eine 
cal their coniied exertion is inks Ba 
ilibri ereaieal solumn. 
axis. The loofenefs of the fynovial membrane admit 
greateft latitude of motion in the inferior horizontal planes 
of atlas on the fuperior o is this’ 
i ation is limited merely by ‘the odontoid liga-° 
and 
~ 
otion - 
ther "aifpotition Pedicle to fecure the fame objeét, that 
there are no la iteral ia 8 that can in any way check the- 
motion. 
rotatory ne of the articulation, in this mo- 
tion, is as follges 2 ee: arch of the atlas, and the tranfverfe° 
Bs rament roll againit the odontoid procefs ; ; the inferior hori- 
os planes o ‘of the former’ move over ‘thofe- of the latter, 
afs confiderably over their edges, in oppofite diredtions: 
he Fight and left fides. “The Fyn nee membranes, the - 
’ peculiar to the head a 
he _— _— afons, ages, &c. 
ral. a os for a kennel; a deer’s or boat's 
‘ antique Doric temples; we 
% 
anterior and ee ligaments, and the odontoid iis 
are itretched. 
part in this w way they are fixed a rior nk het 
ing aly forces that might incline them in ait ei 
The 1 mufcles, which rotate, are the repo: %. 1, la 
tiffimi colli; 2, obliqui capitis inferiores ; 3 of the 
Select colli, ss = » mufcles enumerated laf, ‘sit the 
interni capitis m 
« During thefe motion,” fays Dr. Barclay, “ the ieee 
atlas, and the mufcles of the neck, 
from the vertebra = sien downwards, become fixors; and 
thus the inclinations of the head and i arifing loa the: 
re prevented, 
the mufcles employed to roll the head, 
to the rents are : 1, the right latiflimus 
maftoideus ; 3, part of the left trapezius ; ; 
nius pei ‘and.colli ; ; 6, left complexus ; 7 
pitis pofticus major ; 8, right obliquus capitis 1 
* robe seuttiile tad oldie. The remaining halves of the 
me pairs will roll it to the left ; and the twe halves of t 
fame pairs a&t au tiaie as moderators and motors ra 
the mufcular Motions, p p- 321 
qwater in = and dropfy in the. See Hyproce 
pHatus and Drop 
Heap, Injuries ef See Insurtes a the Head. 
Heap, Uleers of the. PorR 
Heap of Birds. See a 
- Heap of Fifh. See Fis 
Heap is alfo applied ina coat gi = ipsa to ae 
uppermoft or principal extremity of a ps or 
tively, when fpeaking of communities, - the {uperior 5 oh 
when referred to place or priority, is that {tation or pofition 
which is moft honourable. 
- Heap, in Archite@ure. Heads are ufed as an ornament 
of feulpture or carved work, ranegssen a ire as the key: 
of an arch or plat-band, and other oc 
Thefe ede ufually reprefent Soche: of f the heathen divie: 
rs 
: “i Ye beaits are alfo ufed in places 
ullock’s or th h for a fham 
or fheep’s head, ri a park x 0: 
; ora horfe’s, for a ftable, & 
lacie’ or rams? heads 
flayed as a eeckeabel of the 
are 
Th Heraldry, “hie heads of men, bealts, bids pes 
borne in armoury, e either full-faced and in. fro wadighd 
ed and in profile, which muft be diftinguish 
sncient coin 
ebnetie: lap 
In the imperial medals, where the head is iteba 5 it 
is ufually a fign the perfon was not an the em" 
of the children of — or the cant heir of ed 
pire © inftances of thofe who were 
Ceefars, th leur 
zoning. 
* Among aeenihee the different heads on 
are diltinguifhed the different drefles. 
EDAL. : 
Though w 
and never Sacipicds aoe crowned with 
