m^OLUNTAET MrSCULAE TISSUE OE THE UEINAET BLADDEE. 477 
PLATE XXVII. 
Fig’. 4. The chief characters of the involuntary fibres of the bladder have been here 
portrayed, Viz. the inextricable interlacement, the striated appearance of the 
surface, the corpuscles, and the slender form with nearly uniform width. 
The fibre referred to by the letter a is furnished with three large corpuscles, 
and with one small, apparently imperfect body. 
Fig. 5. A granular state of the involuntary fibres is here indicated, A similar condition 
may be seen more frequently in voluntary muscular fibres. It has not the 
appearance of fatty degeneration. 
Fig. 6. Parts of two muscular fibres of the bladder, viewed through an object-glass of 
th of an inch focus, are drawn in this figure. The dotted and striated sur- 
face-markings, illustrating the structure, are very ditficult to recognize and to 
picture. Oblique is better than direct light for examining the object, as the 
latter causes the dots to appear like lines. Shading the mirror of the micro- 
scope at a distance is sometimes more serviceable for seeing what is described, 
than either of the before-mentioned modes of illumination. 
Fig. 7. Is a representation of the ending of a bundle of the muscular fibres of the bladder 
in its tendon. Diminishing in size, the fibres penetrate a certain distance 
without losing their characters ; but they then give place to bundles of fibrous 
tissue, which become undiscernible as distinct bands amongst the mass of 
surrounding fibrous tissue. A like arrangement exists at the opposite side 
of the tendon. Corpuscles can be recognized on the fibres near their inser- 
tion in the tendon. 
Fig. 8. Exhibits the ending of a single fibre of involuntary muscle of the bladder, mag- 
nified 600 times. The terminal division of the fibre, and the wavy fibrous 
tissue encasing the whole, are delineated in detail. The offset of fibrous tissue 
is prolonged finally to the common tendon of insertion. In the preparation 
from which the drawing was taken, the solid part of the fibre was not quite 
so long as it is here made. 
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