From Wikipedia, the free encyclopedia. This epithelium is associated with filtration and diffusion. Squamous metaplasia may appear as a patchily distributed pale cluster or sheet-like areas or as glassy, pinkish-white membranes, with crypt openings, with tongue-like projections pointing towards the external os. Often no vascular pattern is seen on the original squamous epithelium. The columnar epithelium does not stain with iodine Figure 6.
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Chapter 6: Colposcopic appearance of the normal cervix
The reticular pattern is especially visible because the epithelium is thinner in women taking oral contraceptives and in postmenopausal women. Immature squamous metaplastic epithelium usually does not stain with iodine or may partially stain if it is partially glycogenated. The original squamocolumnar junction forms the outer, distal, or caudal border of the transformation zone through its entire degree circumference. The columnar villi turn white, obliterating the red colour of the columnar epithelium. In the earliest stage, the translucence of the columnar epithelial villi is lost and the villi become opaque at their tips; the villi widen and flatten and successive villi fuse in clusters and sheets with a pale pink colour Figures 6. The typical vessel formations in the metaplastic epithelium include long regular branching vessels with gradually decreasing calibre and a network of regular branching vessels Figure 6. Retrieved from " https: Capillary network in c Finally, the immature metaplastic epithelium becomes a fully developed mature metaplastic squamous epithelium resembling the original native squamous epithelium, except for the presence of some crypt openings Figure 6. Tree-like branching vessels may be observed on the newly formed metaplastic squamous epithelium.
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Simple squamous epithelium
One capillary network is confined to the stromal core of each grape-like villus Figure 6. A method of identifyin The vast range of colposcopic appearances associated with squamous metaplasia after the application of acetic acid presents a challenge to differentiate between these normal changes and the abnormal features associated with CIN. It is acceptable to take a biopsy when in doubt. This means that the squamocolumnar junction should be visible in its full length. Large, deep branching vessels may be seen in some cases. The colour changes in Unless the provider can adequately examine the entire transformation zone with the colposcope, the colposcopic examination is termed inadequate or unsatisfactory. Often no vascular pattern is seen on the original squamous epithelium. Colposcopic appearance of the normal cervix Colposcopy and treatment of cervical intraepithelial neoplasia:
Description:Immature squamous metaplastic epithelium usually does not stain with iodine or may partially stain if it is partially glycogenated. Large, deep branching vessels may be seen in some cases. The skill for these manoeuvres comes with practice. Small polyps may be detected during examination of the endocervical canal. The landmarks and full extent of the transformation zone should again be observed carefully. It is also called pavement epithelium due to its tile-like appearance. Tree-like branching vessels may be observed on the newly formed metaplastic squamous epithelium. The vessels in the columnar epithelium actually are terminal capillary networks. Use of a higher power of magnification about 15x , if available in the colposcope, also is helpful. The most important anatomical concept that a colposcopist must have is how to identify the transformation zone see Chapter 5 , Figure 5.
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