Development of the Muscular System
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Created by:
chaiteapaddy on September 18, 2011
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17 terms
Terms | Definitions |
|---|---|
 Somatic Mesoderm | Wall of the body cavity |
| Splanchnic Mesoderm | Visceral, internal organs (innervated by the autonomic nervous system). Surrounds the gut tube. |
| Paraxial Mesoderm | Longitudinal blocks on either side of the notochord that give rise to the axial skeleton and skeletal muscle. |
| Intermediate Mesoderm | Gives rise to the urogenital system |
| Lateral Plate Mesoderm | Gives rise to connective tissue, the skeleton of the limbs, smooth muscle/connective tissue of viscera and blood vessels |
| Sclerotome | Ventromedial portion of the somite closest to the notochord. Cells migrate around neural tube and notochord to form the vertebrae. |
| Dermatome | Part of the somite which gives rise to the dermis. Farthest from the notochord. Skin = epidermis (surface ectoderm) + dermis (somite) |
| Myotome | Part of the somite which gives rise to the muscles. Medium distance from the notochord. |
| Intervertebral disks | What structure does the notochord give rise to in the spinal column? |
| Interplay of Hox 5, 6, 9 and 10 | What determines the fate of each developing vertebrae? |
| Epimere | Gives rise to epaxial muscles, those deep in the back |
| Hypomere | Gives rise to hypaxial muscles, those of lateral and ventral body wall |
| Dorsal Ramus | Innervates epaxial muscle. Carries information out. |
| Ventral Ramus | Innervates hypaxial muscle. Carries information out. |
| Caudal Dysplasia | Total or partial failure of the lower vertebrae to develop with associated abnormalities of the lower extremities, spine, kidneys, GI tract, urogenital tracts etc. |
| The Coelom between the Somatic and Splanchnic Mesoderm | What will give rise to the pelvic, thoracic and abdominal cavities? |
| A small portion of the Yolk Sac | What becomes pinched off inside the developing gut tube by the folding somatic and splanchnic mesoderm? |
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