Myometrium consist of three layers of smooth muscle

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Myometrium : consist of three layers of smooth muscle fibers that are thickest in the fundus and thinnest in the cervix.
During labor and childbirth, contractions of the myometrium in response to oxytocin from the posterior pituitary help expel the fetus from the uterus. Endometrium : the inner layer of the uterus, Its stratum functionalis layer is shed each month during menstruation The stratum basalis layer is permanent and give rise to new stratum functionalis after each menstruation. Homologous Structures of the male and female reproductive system Mammary Glands o Function in synthesis, secretion, and ejection of Milk (Lactation). o Lactation Refers to production, secretion, and ejection of milk from the nipples, a process associated with pregnancy and childbirth. o Production Milk is carried out by mammary glands Each mammary gland divides into 15-20 lobules separated by adipose tissue Within each lobule are small lobules containing the actual glands which product the milk called the alveoli .
o Ejection Milk production in the alveoli move through the secondary tubules and into the mammary ducts, then from there it enters the lactiferous sinuses, then the lactiferous ducts. Each lobe is typically served by a single lactiferous duct, which eventually carries the milk to the surface. o Hormonal control Milk production is stimulated by prolactin Milk ejection is stimulated by oxytocin o Prolactin- milk producing hormone Levels increase as pregnancy progresses, but the presence of progesterone inhibits the effects of prolactin. After delivery, progesterone, and estrogen level decrease, which means prolactin becomes more effective. o Oxytocin- hormone to eject the milk from glands Milk is formed by the alveoli is stored until the baby begins sucking, at which point nerve impulses work on the posterior hypothalamus to induct oxytocin secretion. Oxytocin works on myoepithelial cells that surrounds the glands and ducts. Oxytocin also inhibits the release of prolactin-inhibiting hormone, thus increasing prolactin levels and milk production. o Benefits of breastfeeding Beneficial cells : gives baby important white blood cells. Beneficial molecules : transfer IgA antibodies, which typically afford the baby protection from harmful microbes in the environments it shares with its mother. Supports optimal growth; enhances neurological development; establishes mother infant relationships; ready and adequate form of nutrients that is sterile and designed for baby’s digestive system.
Hormones work in regulating female reproductive cycle o Both male and female share: GnRH, FSH, LH, and Inhibin. o LH stimulates ovulation that secrete estrogens and inhibin LH also stimulates corpus luteum that secrete progesterone, estrogens, relaxin, and inhibin.
o FSH stimulates the initial growth of ovarian follicle and the development which secrete inhibin and estrogen.

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