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Somites and Segmenta

Somites and Segmentation Directed Study 9/28/12

What 10 things does the mesoderm develop into? muscle, CT, cartilage, bone, blood, blood vessels, kidneys, spleen, gonads, and suprarenal cortex
What is the mesoderm produced by? Primitive streak
By day 17, the mesoderm differentiates into what three regions? Paraxial, intermediate, and lateral mesoderm
Where does the paraxial mesoderm thicken? Near the midline, on each side of the notochord, and neural plate.
Where is the lateral mesoderm located? thin plates at the lateral edge of each side of the germ disc
What does the lateral mesoderm develop into? Coelom
What does the intermediate mesoderm develop into> components of the urinary system
By the beginning of week 3, the paraxial meosderm becomes segmented into _________________. somitomeres
What does a somitomere consist of? concentric whorls of cells on each side of the embryo
What does each somitomere form beside in the anterior region? neural plate segment (neuromere)
What do the somitomeres near the neuromeres contribute to? Head mesenchyme
In the medial and posterior regions, somitomeres are further organized into ________________. Somites
Somites develop first in the _________ __________ on day 20. occipital region
Proceeding in the ____________ direction, about 3 somite pairs differentiate per day. posterior
The first _______ and the last 5-7 ________ somites later disappear. occipital, coccygeal
The other somites develop into the __________ __________. Axial skeleton
How many layers do the somites begin to differentiate into by the beginning of week four? 3
The ventral and medial walls lose cohesion. This produces what kind of cells? Mesenchymal
What do these cells surround? Notochord
What are these mesenchymal cells surrounding the notochord known as? Scherotomes
What is the remaining dorsal wall of each somite called? dermomyotome
What does the dermomyotome laminate into? Two layers
What ate the two layers called? myotome, dermatome
What do sclerotoes produce? Vertebrae by differentiating into cartilage and bone
What to myotomes differentiate into? Muscles attached to each vertebra and limbs
What do dermatoms produce? Underlying dermis of the skin
Somites give rise to what pattern of our bodies? Segmented
Created by: 583931909