Embryology
Embryology

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▲ image credit: Mariana Ruiz Villareal - fimbria of Fallopian tube loosely adhere to site of maturing ovarian follicle - ovarian surface breaks down over mature follicle, and ovum is released - ovum is surrounded by the zona pellucida and cumulus oophorus of t heca cells - first polar body is located in zona pellucida, and second polar body is located in ovum’s peripheral cytoplasm and is extruded during fertilization - movement of ovum down Fallopian tube is assisted by cilia of tubal epithelium - maturation of spermatids to motile spermatozoa occurs in the epidydimis of the testis, then spermatozoa flow in ductus (vas) deferens to ejaculatory ducts and seminal vesicles - mitochondria, at base of f lagellum, produce ATP, but are lost during fertilization - spermatozoön ( singular ) includes centrioles, but ovum centrioles are lost after meiosis - fertilized ovum has maternal mitochondria and paternal centrioles - “capacitation” o f spermatozoa ( pl. ) occurs by contact with uterine mucosa (endometium) and mucosa of the Fallopian tube (endosalpinx) - acrosome has enzymes activated during ‘capacitation’ which facilitate the penetration of the cumulus oop horus and zona pellucida, and integrin proteins to facilitate fusion of the sperm and egg cell membranes © - fertilization