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Transcript 
PowerPoint® Lecture Slides
prepared by Leslie Hendon,
University of Alabama,
Birmingham
3
HUMAN
ANATOMY
PART 2
Basic
Embryology
fifth edition
MARIEB | MALLATT | WILHELM
Copyright © 2008 Pearson Education, Inc.,
publishing as Benjamin Cummings
Changes in the Embryo
Copyright © 2008 Pearson Education, Inc., publishing as Benjamin Cummings
Figure 3.7a, b
Changes in the Embryo
Copyright © 2008 Pearson Education, Inc., publishing as Benjamin Cummings
Figure 3.7c, d
Week 4 – The Body Takes Shape

Folding of embryo laterally and at the head and
tail
 Embryonic disc bulges; growing faster than yolk
sac
 “Tadpole shape” by day 24 after conception
 Primitive gut – encloses tubular part of the yolk
sac
 Site of future digestive tube and respiratory
structures
Copyright © 2008 Pearson Education, Inc., publishing as Benjamin Cummings
Week 4 – The Body Takes Shape
Copyright © 2008 Pearson Education, Inc., publishing as Benjamin Cummings
Figure 3.8
Week 4 – The Body Takes Shape

Derivatives of the germ layers
 Ectoderm forms
 Brain, spinal cord, and epidermis
 Endoderm forms
 Inner epithelial lining of the gut tube
 Respiratory tubes, digestive organs, and urinary
bladder
 Notochord – gives rise to nucleus pulposus within
intervertebral discs
Copyright © 2008 Pearson Education, Inc., publishing as Benjamin Cummings
Week 4 – The Body Takes Shape

Mesoderm – forms
 Muscle
 Bone
 Dermis
 Connective tissues (all)

Mesoderm differentiates further and is more
complex than the other two layers
Copyright © 2008 Pearson Education, Inc., publishing as Benjamin Cummings
Derivatives of Germ Layers
Copyright © 2008 Pearson Education, Inc., publishing as Benjamin Cummings
Figure 3.10
Week 4 – The Body Takes Shape

Mesoderm (continued)
 Somites divides into
 Sclerotome
 Dermatome
 Myotome
 Intermediate mesoderm forms
 Kidneys and gonads
Copyright © 2008 Pearson Education, Inc., publishing as Benjamin Cummings
Week 4 – The Body Takes Shape

Mesoderm (continued)
 Splanchnic mesoderm
 Forms musculature, connective tissues, and serosa
of the digestive and respiratory structures
 Forms heart and most blood vessels
 Somatic mesoderm – forms
 Dermis of skin
 Bones
 Ligaments
Copyright © 2008 Pearson Education, Inc., publishing as Benjamin Cummings
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