4.36 M E M O I R S 0/ the 
relb upon R thin» pellucid, and bony Lamina or plate, which 
partly conllitutcs the brim of the orifice of the "DuEiusfemi-ovaUs 
fpiralis ^ and partly the internal fide of the fecond winding of the 
Lamina fpiralis, which furrounds the Ni^ckus ^ fo that that 
fecond winding of the Lamiv a fpiralis, is partly bony and partly 
nervous : In the middle of the Nucleus pyramidalis is a very thin 
bony prominence, found in adults, of an orbicular form, and about 
i of a line in breadth, which adheres to the internal fuperficies of 
the cavity of the Cochlea, and therefore Vieujfens calls it the orbi- 
cular Apophyfis of the Cochlea-^ there is but one Cellula in the 
middle of the bone, which forms the extremity of the Cochlea 5 
befides, the whole interior fuperficies of the Cochlea is very 
Imooth, and when viewed by a microfcope, it appears perforated 
with feveral very fmall Foramina, efpecially in that part, which 
borders on the bafis of the Nucleus pyramidalis : The fecond 
part of the Cochlea is the femi-oval fpiral duft, which extends 
from its bafis, where this duct takes its rife, to the fuperior part 
of the Veftibulum Trimum of the labyrinth, and reaches to the 
fmall chink in the bafis of the Veflibulum Secundum j its cavity 
is formed in fuch a manner, as to become a femi-oval fpiral, and 
be fomewhat broader at its termination, than its beginnings ."P^." 
removing that branch of the Tortio Mollis of the ear, which is 
fpread thereon, there is obferved in it a very (lender bony procefs, 
which extends from the internal fide of the bafis of the Nucleus 
pyramidalis of the Cochlea to its extremity; this Vieujfens calls 
from its fmallnefs, the bony line of the femi-oval fpiral du£l of 
the Cochlea. The "Portio Mollis, or foft branch of the fe- 
venth pair of nerves is thicker than the Portia 'Dura, or hard 
branch, tho' it receives much fewer medullary fibres fi-om the 
*iPrQceJfus annularis, as it enters the internal duiSl of the ear, it is 
divided into three fmall ramifications ^ viz. the fuperior, infe- 
rior, and the middle ; the fuperior enters the cavity of the Con- 
cha thro* a peculiar Foramen cut out in its upper part, where it 
fpreads itfelf into an exquifite fine foft membrane, which lines 
its whole fuperficies, excepting one fibril which ftill retains the 
form of a fmall nerve, and which lies upon, and adheres to, the 
fmall and fomewhat acute bony Apophyfis, in the internal edge 
of the above Foramen 5 this fmall, foft, and fine nerve, isclofely 
accompanied with its little artery and vein 5 when it leaves the 
bony apophyfis, it runs along the middle of the cavity of the 
Concha like a flretched firing, and extends to the fide of the 
^orta communis of the fuperior and inferior femi-circular du6ls, 
to which it adheres, and into which it afterwards enters, and 
then 
