248 MAMMARY 
We must next direct our attention to the 
internal structure of the breast, first as regards 
the protective arrangements. 
e fascia enveloping the breast, like the 
tunica albuginea of the testicle, sends in pro- 
cesses to support and protect the secreting 
membrane of the gland and suspend it in its 
Situation. These processes are all denomi- 
nated by Sir Astley the ligamenta suspensoria, 
(fig. 73). The ends of these ligaments are 
spread out and incorporated with the posterior 
surface of the skin, and give it whiteness and 
firmness.” 
The secerning portion of the gland con- 
sists of the minute cells which were referred to 
at the commencement of this article, and we 
learn from Sir A. Cooper that “ their size in 
full lactation is that of a hole pricked in paper 
by the point of a very fine pin; so that 
the Gallles, when distended with quicksilver 
or milk, are just visible to the naked eye. 
( Fig. 74.) They are rather oval than round, 
Fig. 74. 
Shews the origin of the ducts 
from the milk cells, (injected 
with quicksilver and magnified 
four times. ) 
being slightly elongated where the bunch of 
the lactiferous tubes springs from them; but 
they appear more rounded to quicksilver, and 
Fig. 
A view of the preparation of six milk tubes 
c, c, ec, the branches of the mammary ducts. 
d, d, d, d, their glandules. 
injected from the nipple. 
a, a, a, the straight or mammillary Sabon, f Hy 
b, b, b, the reservoirs or dilatations of the du 
GLANDS. 
when distended with milk than when filled” 
with wax.” 
These minute cells or cellules are bound up — 
together so compactly as to form little bodies” 
or “ glandules,” varying in size from a pin 
head to that of a small tare. When se ed | 
from the rest of the gland but attached to the 
mammary duct, which originates in se » 
branches from its cellules, it presents a 
mose appearance. 
From the cedlules the milk-tubes originate i 
a radiate form by small and numerous branches, 
They increase in size by repeated unions, an 
terminate by five or six branches in dilatations 
the “ reservoirs” of Sir Astley. “ These re 
tacles are of a conical form (see fig. 75) 
the mammillary tubes, and they begin fre 
the extremities of the larger branches of the 
milk-tubes and terminate in the straight du 
of the nipple.” ' 
In most other classes of the Mammalia th 
reservoirs are much larger than in man, wher 
they hardly deserve the title, and in the cow 
they are so capacious as to be capable of cone 
taining at least a quart. d 
The different ducts of these reservoirs take 
straight course, diminishing in size, 
the nipple to its extremity, where they te: 
in a cribriform manner, with very con 
orifices, varying in size from those of a k 
to a common pin. Their number is 
twenty. w 
Arteries—The mamma receives its — 
ply of blood from branches of the internal 
mammary, axillary, and intercostal eries. 
Sir Astley divides them into anterior and pos- 
terior, the former passing from the axillary 
artery and the latter from the internal mame 
t 
nrouw 
75. 
proceeding from the apex of the nipple, 
cts. 
