KINESIOL 2Y03 Lecture Notes - Lecture 2: Twin, Prenatal Development, Yolk Sac
6 Dec 2017
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Document Summary
Where it all began: the uterus is a triangular structure. Ovary is where we have the female gametes or sex cells. During intercourse, when the male ejaculates it releases approx 200 million the cervix connects the vagina to the uterus sperm cells are deposited into the vagina. Only about 1% of the sperm actually make it into the uterus. This is because the ph of the secretions of the vagina can kill off the sperm and some sperm cells are just not as viable and cannot swim all the way to the uterus. Once the sperm gets into the uterus, it starts to contract due to oxytocin and proxygaldins to help the sperm move along. About 100-200 sperm cells actually reach the oocyte. Most sperm die after 24 hrs once in the uterus. Clinical/medical events: date since last menstrual period (clinical age of unborn child) Embryologists: post-ovulatory age (approximately 14 days less than clinical age)
