human development. ro/malerepro.htm
TRANSCRIPT
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HUMAN DEVELOPMENT
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http://www.ich.ucl.ac.uk/ich/html/postcards/
http://www.lab.anhb.uwa.edu.au/mb140/CorePages/MaleRepro/malerepro.htm
www.DennisKunkel.
Human sperm have typical sperm structure. The human testis looks like the primate testis you looked at in lab.
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The human ovary has the same structure as the cat ovary you have looked at in lab.
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Fertilization and early cleavage.
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The second cleavage in a human zygote.
Figure on P. 171 of your text.
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Human cleavage
40-50 hr 60 hr
compaction
http://arbl.cvmbs.colostate.edu/hbooks/pathphys/reprod/fert/cleavage.html
http://www.alphascientists.com/embryology_images/index.html
Figure similar to that on P. 170 of your text.
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“Hatching” from the zona pellucida.
Strypsin protease digests hole in zona pellucida
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Human blastocyst - pre-implantation
Plasminogen activator will be secreted by the trophoblastic cells that form the
syncytiotrophoblast.
See figure of 6 day human blastocyst in lecture packet
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See figure of implanting 6-7 day human blastocyst in lecture packet
Plasminogen activator will be secreted by the trophoblastic cells that form the
syncytiotrophoblast.
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Heuser’s membrane is an ephemeral combination of extracellular matrix and hypoblast cells.
See figure of 8 day human embryo in lecture packet
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See figure of end of second week human embryo in lecture packet
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See beginning of 3rd week human embryo in lecture packet - primitive streak forming.
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Figure illustrating spread of mesoderm between epiblast and hypoblast - like what happens in chicken embryos.
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Movements in Gastrulation figure in lecture packet.
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By the end of the 3rd week, chordin and noggin secreted by the chordamesoderm have blocked BMP-4. As a result,
neurulation occurs.
Human neurulation figure in lecture packet.
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http://www.biology.iupui.edu/biocourses/n100/2k4ch39repronotes.html
Figure of human primitive streak and neurulatiopn at web link below
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“Sequence of flexion in longitudinal section” figure in lecture packet.
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Fourth week human embryo figure in lecture packet.
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Eighth week human embryo figure in lecture packet.
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Carnegie stages of human embryos
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Carnegie stage 13 - human embryo
The Virtual Human Embryo Project
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Carnegie stage 13 - human embryo
The Virtual Human Embryo Project
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Carnegie stage 13 - human embryo
The Virtual Human Embryo Project
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* Chorioallantoic placenta - chorion and allantois form placenta
*Hemochorial placenta - villi that are formed from the chorion are bathed in blood.
*Deciduous placenta - tears away from the uterine wall at birth causing hemorrhaging.
CLASSIFICATION OF THE HUMAN PLACENTA
Figure on page 290 of your text
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Figure on page 284 of your text
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Syncytiotrophoblast and Cytotrophoblast
Figure of 13th day blastocyst in lecture packet.
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Development of the human placenta
Figure of placental development passed out in class
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Figure of placental development passed out in class
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Figure of placental development passed out in class
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Figure of placental development passed out in class
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Figure of placental development passed out in class
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Figures on pages 284 and 290 of text.
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33
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Turn on pic-in-pic
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Conjoined twins
• May be caused by both genetic and environmental factors
• 1 in every 40,000 births, but often still born
• 1 in every 200,000 live births
• 75% are still born or die within 24 hr of birth
• More often female than male (3:1)
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