Archive image from page 586 of The cyclopædia of anatomy and. The cyclopædia of anatomy and physiology cyclopdiaofana0402todd Year: 1849 VEIN. 1371 free margin of valves I have occasionally seen, as noticed above, a clear, structureless rim, which 1 have imagined to be this membrane reduplicated, the membrane being extremely thin, and the interposd fibrous lamina not reaching quite to the margin. It is said by Henle and others only to exist in a few places, and certainly it is not always to be found, though it is not perhaps right to limit ils existence to those spots only where it has been r
Archive image from page 586 of The cyclopædia of anatomy and. The cyclopædia of anatomy and physiology cyclopdiaofana0402todd Year: 1849 VEIN. 1371 free margin of valves I have occasionally seen, as noticed above, a clear, structureless rim, which 1 have imagined to be this membrane reduplicated, the membrane being extremely thin, and the interposd fibrous lamina not reaching quite to the margin. It is said by Henle and others only to exist in a few places, and certainly it is not always to be found, though it is not perhaps right to limit ils existence to those spots only where it has been recognised, as its extreme tenuity and firm adhesion to the next coat might ac- count for its not being generally seen. The tissue in question is best seen by slit- ting up a vein and pinning it out on cork. The inner surface is then scratched with a needle after it has been moistened. The fenestrated membrane retracts, anil its edges may be ruffled up and a small portion removed by the points of very fine forceps, and thus ob- tained for examination, which is best done without any superimposed glass, as that flattens the coils and folds, and it is impossible to unravel them. Fig. 855. the relative thickness of the three elementary fibrous coats. Specimens for displacing the profile views of the walls ol veins are best obtained by slitting up the vessel, pinning it out upon cork, and suffering it to get dry. Sec- tions are then to be made vertical to the surface, either parallel to, or at right angles with, the axis of the vessel. shavings may then be removed with a very flat knife (and for this purpose, a Beer's cornea knife is the best), and when placed on a slip of glass, moistened, and covered with a square of thin glass, are read} for observation. The accom- panying drawings were made from sections thus obtained. When a longitudinal section of the n- Transverse vertical Section of the Wall of the Subclavian Vein of an Of, exhibiting the relative Thickness of tlie
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