Somites and Segmentation Directed Study 9/28/12
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| What 10 things does the mesoderm develop into? | muscle, CT, cartilage, bone, blood, blood vessels, kidneys, spleen, gonads, and suprarenal cortex
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| What is the mesoderm produced by? | Primitive streak
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| By day 17, the mesoderm differentiates into what three regions? | Paraxial, intermediate, and lateral mesoderm
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| Where does the paraxial mesoderm thicken? | Near the midline, on each side of the notochord, and neural plate.
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| Where is the lateral mesoderm located? | thin plates at the lateral edge of each side of the germ disc
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| What does the lateral mesoderm develop into? | Coelom
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| What does the intermediate mesoderm develop into> | components of the urinary system
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| By the beginning of week 3, the paraxial meosderm becomes segmented into _________________. | somitomeres
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| What does a somitomere consist of? | concentric whorls of cells on each side of the embryo
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| What does each somitomere form beside in the anterior region? | neural plate segment (neuromere)
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| What do the somitomeres near the neuromeres contribute to? | Head mesenchyme
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| In the medial and posterior regions, somitomeres are further organized into ________________. | Somites
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| Somites develop first in the _________ __________ on day 20. | occipital region
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| Proceeding in the ____________ direction, about 3 somite pairs differentiate per day. | posterior
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| The first _______ and the last 5-7 ________ somites later disappear. | occipital, coccygeal
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| The other somites develop into the __________ __________. | Axial skeleton
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| How many layers do the somites begin to differentiate into by the beginning of week four? | 3
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| The ventral and medial walls lose cohesion. This produces what kind of cells? | Mesenchymal
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| What do these cells surround? | Notochord
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| What are these mesenchymal cells surrounding the notochord known as? | Scherotomes
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| What is the remaining dorsal wall of each somite called? | dermomyotome
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| What does the dermomyotome laminate into? | Two layers
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| What ate the two layers called? | myotome, dermatome
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| What do sclerotoes produce? | Vertebrae by differentiating into cartilage and bone
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| What to myotomes differentiate into? | Muscles attached to each vertebra and limbs
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| What do dermatoms produce? | Underlying dermis of the skin
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| Somites give rise to what pattern of our bodies? | Segmented
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