The American journal of the medical sciences . e tube, where it fuses with the other layers and forms an irregularraeshwork of muscle fibres, with the fibres running in all directions. Outside of this comes a thinner layer of longitudinal muscle, whichis also very distinct; and upon this follows the subserous connectivetissue. These are the two layers usually described by writers upon the sub-ject, for they are readily seen on section from any part of the tube,except near the fimbriated extremity, where all the layers fuse together. In some cases, however, the two layers become so blended thro
The American journal of the medical sciences . e tube, where it fuses with the other layers and forms an irregularraeshwork of muscle fibres, with the fibres running in all directions. Outside of this comes a thinner layer of longitudinal muscle, whichis also very distinct; and upon this follows the subserous connectivetissue. These are the two layers usually described by writers upon the sub-ject, for they are readily seen on section from any part of the tube,except near the fimbriated extremity, where all the layers fuse together. In some cases, however, the two layers become so blended throughoutthe entire length of the tube that it is impossible to separate them.(Fig. 4.) These two layers correspond to the outer and middle coats of theuterus, and constitute almost the entire thickness of the wall of the tube. Beside these two layers there is a third, corresponding to the third orinner muscular coat of the uterus. On cutting sections of the tube justat the cornu uteri (Fig. 1) one sees, just within the circular layer, a Fk;. Cross-section of tube at cornu uteri, showing the four ]irimary folds of the mucousmembrane and the three layers of muscle forming the tube wall. well-marked but thin layer of longitudinal muscular fibres. This canbe traced as a distinct layer for some little distance, but it graduallybecomes thinner and thinner, and, fusing with the circular coat, finallydisaf>pears. WILLIAMS, HISTOLOGY OF FALLOFIAX TUBES. 379 Fig. 2 represents a section from the same tube about one inch nearerthe fimbriated extremity than Fig. 1; and even at this distance fromthe uterus, the inner longitudinal layer has completely disappeared. Itis apparently due to this fact that it is not mentioned by most writers,for sections from the middle portion of the tube show no trace of it. Fig. 2.
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