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Importance of Uterine Smooth Muscles in Normal Labor.

Normal Labor is a process of different stages in which there is contraction of uterine which leads to dilatation and effacement of cervix and other voluntary forces resulting to the expulsion through vagina. Normal delivery is the phenomenon of the expulsion of placenta and fetus. Most women experience delivery without any complications. The main point is to safeguard the health of the mothers and their newborns. Apart from that, the medical staff should make the patient feel comfortable and keep them updated regarding the whole process of delivery.

Encouragement should be done for the physical contact between the parents and new born. The obstetrician should overcome all the complications which may occur during the whole process of delivery. Good management should be closely observed and safety precautions should be taken to overcome any unsuitable condition.

Basically the uterine contraction during delivery is a process in which uterine smooth muscle contract. The uterine smooth muscles, including the myometrium have unique character of smooth muscles as compare to skeletal muscles of the body as they have efficiency of unique consequence of contractions which results in the delivery of uterus. The movement is categorized into the following steps as compare to skeletal muscles;

First, the magnitude of contraction of smooth muscles may be greater than the striated muscle cells. The smooth-muscle cell shortens with contractions.

Secondly, forces can be exerted in smooth muscle cells in multiple directions, whereas the contraction force generated by skeletal muscle is always aligned with the axis of the muscle fibers .

Thirdly, smooth muscles are randomly organized while the smooth muscles are well organized. In the myometrium, there are thin and thick filaments which are in the form of long, random bundles throughout the cells. This arrangement of cells aids force-generating capacity and greater shortening.

Lastly, in the uterine fundus, there is greater multidirectional force generation as compared with that of the lower uterine segment which helps in the expulsive force directionality.

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