GROWTH DEV FARM ANIM
GROWTH DEV FARM ANIM ANS 3043
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This 1 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 9 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 8 Early Embryonic Growth III A Somitogenesis ridges formed on mesoderm on primitive streak that serve as precursors to skeletal and muscle systems 1 Somites collection of mesoderm masses on either side of neural tube with development being rostal toward the head to caudal toward the tail a Each somite is paired to a corresponding somite on the other side of the neural tube b Two types of somite cells 1 Sclerotome cells nearest to the neural tube and migrate around the tube to form the vertebrae column 2 Dermamytome there are two types dermatome and myotome Dermatome is closest to outer ectoderm and forms the skin and Myotome is more ventral and develops into muscle Myotome cells also migrate to other parts of the body to form the axial skeleton by chemotaXis and they do this by following a chemical trail B Limb bud formation somites closest to the point of limb bud formation migrate under ectoderm and form a mass of precursor cells for the limb bud 1 I A 139 Organizing centers for limb bud 39 I of tissues in given areas a Zone of Polarizing Activity ZPA organizes limb bud in interior and anterior axis b Apical Ectoderm Ridge AER maintain outgrowth of limb by keeping the underlying cells in the polarizing zone in a undifferentiated state to form the sclerotome myotome and dermatome 1 I the d I C Tubulation at body develops into a cylindrical body containing tubular structures 1 invagination of cells around primitive streak 2 formation of the neural tube a primordial gut 3 eventual division of the coelomic cavities pericardial pleural and peritoneal 4 complete by day 15 in pigs species differ D Be familiar with all pictures and graphs
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