Help
Options
Didn't know it?
click below
click below
Knew it?
click below
click below
Don't Know
Remaining cards (0)
Know
retry
shuffle
restart
0:00
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.
Normal Size Small Size show me how
Normal Size Small Size show me how
Somites and Segmenta
Somites and Segmentation Directed Study 9/28/12
| Question | Answer |
|---|---|
| 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
Popular Medical sets