ANAT 1502 Embryonic Development (4th-8th Week)

ANAT 1502 Embryonic Development (4th-8th Week) - 4 -12...

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Phases of Embryonic Development • Growth – cell division • Morphogenesis – cell migration • Differentiation – formation of functional tissue and organs Monday, July 12, 2010
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Folding of the Embryo • Edges fold – cranial/caudal (head/tail folds) – lateral edges - embryo becomes cylindrcal Monday, July 12, 2010
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Germ Layer Derivatives • Ectoderm – CNS, PNS, sensory epithelia, epidermis, mammary glands, pituitary gland, subcutaneous glands • Mesoderm – connective tissue, muscle, bone, heart, kidneys, gonads • Endoderm – GI tract, respiratory tract, liver, tonsils, bladder, auditory tube, Monday, July 12, 2010
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Control of Embryologic Development • DNA • Environment -early on stem cells are pluripotent • Growth - mitosis • Induction - chemical messages Monday, July 12, 2010
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Highlights (4th week - 8th week) • Week 4
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Unformatted text preview: 4 -12 somites neural tube is open - close by the end of the week branchial arches appear embryo is curved heart is pumping limb buds appear otic pits / lens placodes tail shrinks Monday, July 12, 2010 Highlights (4th week - 8th week) Week 5 growth of head mesonephros Week 6 elbows/hands movements and reflexes ear/eye Monday, July 12, 2010 Highlights (4th week - 8th week) Week 7 change in limbs umbilical herniation Week 8 scalp vascular plexus purposeful movements ossification no tail limbs move ventrally Monday, July 12, 2010 Estimation of Age Carnegie system Surface features Size greatest length crown rump (sitting) crown heel (standing) Monday, July 12, 2010...
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ANAT 1502 Embryonic Development (4th-8th Week) - 4 -12...

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