Uterine contractions are muscle contractions of the uterine smooth muscle that can occur at various intensities in both the non-pregnant and pregnant uterine state. The non-pregnant uterus undergoes small, spontaneous contractions in addition to stronger, coordinated contractions during the menstrual cycle and orgasm. Throughout gestation,[1] the uterus enters a state of uterine quiescence due to various neural and hormonal changes. During this state, the uterus undergoes little to no contractions, though spontaneous contractions still occur for the uterine myocyte cells to experience hypertrophy.[1] The pregnant uterus only contracts strongly during orgasms, labour, and in the postpartum stage to return to its natural size.[2]
^ abRosen, Hadar; Yogev, Yariv (3 March 2023). "Assessment of uterine contractions in labor and delivery". American Journal of Obstetrics and Gynecology. 228 (5): S1209–S1221. doi:10.1016/j.ajog.2022.09.003. PMID 37164494. Retrieved 17 March 2024.
^Tingåker, Berith K; Irestedt, Lars (June 2010). "Changes in uterine innervation in pregnancy and during labour". Current Opinion in Anesthesiology. 23 (3): 300–303. doi:10.1097/ACO.0b013e328337c881. ISSN 0952-7907. PMID 20216064. S2CID 35342557.
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