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Anatomy: Muscles

Lecture 9: Overview of Muscles of the Body

QuestionAnswer
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