ANAT20006 Lecture Notes - Lecture 7: Limb Bud, Phalanx Bone, Septum Primum
15 Aug 2018
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* divided into paraxial mesoderm (medial) closest to notochord. Lateral mesoderm furthest away from notochord. Axial skeleton vertebrae, ribs & pelvis. Axial and limb muscles (axial muscles are associated with the axial skeleton) * lateral mesoderm ventrolateral body wall (maybe some dermis?) * swellings (somitomeres) appear progressively down length of paraxial mesoderm. * at the 20 somitomere stage, the eight pair of somitomeres becomes an independent pair of somites (the 8th pair of somitomeres break free from surrounding mesoderm and becomes separate and free flowing) * somitomere 8 is at the base of the skull (to of vertebral column). This means that somitomeres will form and give rise to structures from the first cervical vertebra down into the rest of the body. * the head never forms somites, it remains having somitomeres. * sclerotome = skeleton except skill (particularly the axial skeleton) * myotome = trunk muscles (e. g. intrinsic back muscle, muscles of ventrolateral body wall, limb muscle)
