A manual of obstetrics . 34.— section uf a niilliparoiis (a) .Tnd of a multiparoiis (li) uterus: A,cavity of tlic cervix anil arbor vit;c; T, cavity of the body; O, constriction between bodyan<l cervix, the os uteii internum; .V, wall of body (Tarnier). The individual muscular fibers progressively increase inlength, breadth, and thickness, so that the organ at term isabout 12 inches long, 9 inches broad, and 8 inches thick,weighs about 2 i)ounds, and has a capacity of about 400cubic inches. This increase in size is at first most markedin the anteroposterior and transverse
A manual of obstetrics . 34.— section uf a niilliparoiis (a) .Tnd of a multiparoiis (li) uterus: A,cavity of tlic cervix anil arbor vit;c; T, cavity of the body; O, constriction between bodyan<l cervix, the os uteii internum; .V, wall of body (Tarnier). The individual muscular fibers progressively increase inlength, breadth, and thickness, so that the organ at term isabout 12 inches long, 9 inches broad, and 8 inches thick,weighs about 2 i)ounds, and has a capacity of about 400cubic inches. This increase in size is at first most markedin the anteroposterior and transverse diameters, the form THE PHYSIOLOGY OF PREGNANCY. n. of the organ becoming spheric or ovoid, and an increase inthe size of the uterus in these directions is very suggestiveof the existence of has been said that eachfiber is increased from sevento eleven times in length andfrom three to five times inbreadth (Kolliker). Naturally,such an excessive overgrowthrenders the construction ofthe organ more patent, and ahistologic examination of thepregnant uterus at term willreveal three distinct layers ofthe muscular substance. Themiddle layer is the densest,and its fibers have an obliquedirection from above dow^n-ward and from without in-ward. It is the most activeportion in the process ofparturition. The fibers of the external layer run horizon-tally, and are especially active in and around the cervicalregion. The internal layer is but poorly developed, and islargely sphincteric in function, its fibers being mainlygrouped around the orificial regions (the tubes and the osinternum). Not only does the muscular substance undergo this
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectobstetrics, bookyear1
