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by: Laury Kreiger


Laury Kreiger
GPA 3.93


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Class Notes
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This 2 page Class Notes was uploaded by Laury Kreiger on Friday September 18, 2015. The Class Notes belongs to ANS 3043 at University of Florida taught by Staff in Fall. Since its upload, it has received 135 views. For similar materials see /class/206674/ans-3043-university-of-florida in Animal Science at University of Florida.

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Date Created: 09/18/15
Notes 7 Early Embryonic Growth II A 03 U Elongation rapid conceptus growth in a longitudinal fashion which results from cellular remodeling The blastocyst is now getting ready for implantation or attachment to the uterus There are species differences 1 Cow and Sheep elongation occurs between 1317 days and it changes from spherical to filamentous 2 Pig elongation occurs between 1016 days and it changes from spherical to filamentous 3 Horse Prior to day 50 it remains spherical No change to filamentous until N day 50 Gastrulation cell layer formation 1 Cellular reorganization and movement of epiblast cells 2 Initial replication of epiblast cells forms the Henson s node which allows cell migration into the blastocoel 3 The primitive streak forms on the caudal end of the embryo disc which marks the future longitudinal aXis of the embryo It also allows cells to migrate where cells start to become specialized and helps with the formation of mesoderm and endoderm 4 The primitive groove forms a depression at the dorsal end of the primitive streak where epiblast cells migrate medially and ventrally into the groove Germ Layer Formation l Ectoderm Mesoderm and Endoderm are all formed from the epiblast 2 Germ layer development includes cell division migration and introduction Juxtaposition of cellular sheets allow for differentiation due to cell to cell interactions 3 Ectoderm the outermost layer includes the CNS sense organs mammary glands sweat glands skin hair and hooves 4 Mesoderm the middle layer includes the circulatory system skeletal system muscle reproductive system kidneys and urinary ducts 5 Endoderm the innermost layer includes the digestive system liver lungs pancreas thyroid gland and most other glands Neurulation formation of the spinal cord which occurs simultaneous with gastrulation Neural ectoderm outermost layer of the primitive groove and precursors to the neural tube due to the convergence and fusion of folds Neural tube and neurocord earliest identifiable structures of spinal cord neural tube believed to form the disc in between each vertebrae N 3 Neural crust cells cells on the apical aspects of the primitive groove that form peripheral nerves after neural tube closure 4 Nonneurolectoderm forms epidermis of fetus


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