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33 Cards in this Set
- Front
- Back
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Spermatogenesis |
Formation of complete motile sperm from spermatogonia in semeniferous tubles of testis |
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Spermiogenesis |
Transformation on spermatid to sperm |
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Oogenesis |
Differentiation of mature oocyte (ready for fertilization) from oogonia (germ cells) |
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Down syndrome cause (trisomy 21) is |
Maternal meotic nondisjunction in meiosis 2 |
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Ovulation |
Rupture of graffin follicle and discharge of 2ary oocyte on day 14 |
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Corpus luteum secretes |
Progestrone ( for 3-4 months) |
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Chromosome no. Of 23 is in |
Spermatid , 2ndry oocyte & mature ovum |
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Mature follicle is the |
Secondary or graffin follicle |
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Corpus luteum is |
Follicular cells remaining after fertilization |
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Sterile/Unfertile males have |
less than 10 million sperm/ml Less than 70% sperm are motile More than 10% are abnormal |
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Number of sperm should be |
300-500 million/ejaculation 100 million/ml |
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meiosis 2 in females takes place after |
fertilzation |
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function of progestrone |
uterine line thickening |
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Meiosis 1 in females results in |
primary oocyte (first half at birth) seconday oocyte (second half at puberty) |
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if no fertilization corpus luteum |
undergoes corpus Albicans ( becomes fibrous) |
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The source of energy for the sperm lies in its:
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Middle piece
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Fertilization takes place in |
Ampula (Lateral,1/3 of uterine tube) |
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Capacitation of sperm |
Removal of glycoprotein coat |
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After Fertilzation |
oocyte meiosis 2 takes place 46 chromosome number restored sex is determined zona and cortical reaction Segmentation |
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Segmentation of zygot or initiation of cleavage |
repeated mitosis so unicellular zygote become a multicellular blastomeres |
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Zona pellucida function |
keep blastomeres adherent together & prevent theadhesion of blastomeres to the uterine tube
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Morula is the |
16 cell stage reached after 72 hours after fertilization |
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Morula reaches uterine cavity on the |
4th day after fertilization and starts becoming blastocyst |
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Inner cell mass is the |
embryoblast and becomes embryo |
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outer cell mass is the |
trophoblast and becomes fetal portion of the placenta |
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results of cleavage |
cell size decrease, cell no. increase |
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Implantation |
Embedding of free blastocyst in the posterior upper part of the uterus, near the midline and fundus |
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Implantation starts in |
6th day after implantation. embryo is completely implanted in the 9th day |
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Trophoblast function is to |
1)adhere to endometrium 2) erode the endometrium 3)form synsytial trophoblast (mass of tropoplasm) and cytotrophoblast (has cell membrane) |
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Placenta praevia lateralis
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Implantation above internal os |
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Placenta praevia marginalis
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implantation around internal os |
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Placenta praevia centralis
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implantation covers the internal os |
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Implantation outside the uterus is called |
Ectopic pregnancy |
