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Anatomy: Muscles
Lecture 9: Overview of Muscles of the Body
| Question | Answer |
|---|---|
| Functional Groups of Muscles | Musculature of digestive tube (gut muscles) Muscles of body Axis (trunk, neck, head) Limb Muscles Muscles around pharynx (branchial muscles) |
| Mesoderm Germ Layer | Where all muscles originate from |
| Musculative digestive tube & other hollow organs | originate from splanchnic mesoderm around embryonic gut contains smooth muscle (squeeze things through organs heart's cardiac muslce ALSO from splanchnic mesoderm |
| Axial/Trunk Muscles | skeletal muscles of trunk, excluding limbs develop from myotomes |
| Myotomes | develop skeletal muscles of axial/trunk muscles ~40 in embryonic body |
| What happens at 5th week of embryo to myotomes | split ventral/dorsally into epaxial mass and hypaxial mass |
| Epaxial Mass (Epimere) | *means dorsal to vertebral axis form muscles that extend spine Medial Part: deep, short segmented muscles of back (from one vertebrae to next only) Lateral Part: Long muscles of back *erector spinae group also from muscles that tilt head back |
| Hypaxial Mass (Hypomere) |
Created by:
madhatter
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