Archive image from page 586 of The cyclopædia of anatomy and. The cyclopædia of anatomy and physiology cyclopdiaofana0402todd Year: 1849 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
Archive image from page 586 of The cyclopædia of anatomy and. The cyclopædia of anatomy and physiology cyclopdiaofana0402todd Year: 1849 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 Three Coats. a, internal coat; f>, middle coat; c, the entire ex ternal coat. (Magnified 40 diameters.) Internal tunic nf longitudinal fibres. — The internal tunic of longitudinal fibres is ex- tremely thin, and occupies but a very small amount of the thickness of the vessels' walls. This is well seen in , which is a trans- verse section of the subclavian vein of .an ox, made vertical to the surface, and displaying It appears to me that there are sufficient grounds to acknowledge the existence of a limitary membrane beneath the epithelium in the blood- vessels, and no sufficient reason to question its uni- versal distribution. It must be recollected that there are certain regions, even in the mucous mem- brane (the nasal fossa, for instance), where no base- ment membrane has been found, and I am not aware that, in the skin, it has ever been separated from the chorion, and yet in neither case is its existence doubted. To exhibit the limitary membrane well, some peculiar mechanical arrangements of the sur- face is necessary, as
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